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共用题干
Eastern Quakes can Trigger Big Shakes

In the first week of November 2011,people in central Oklahoma experienced more than two dozen
earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium,
caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before.
Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see
reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But
the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.
Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe each
year. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and
unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or
shaking intensity..
A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt
from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New
York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit:
Wikimnedia/Alex Tahak.
Scientists know about small,remote quakes only because of very sensitive electronic devices called seis-
mometers.These devices detect and measure the size of ground vibrations produced by earthquakes.
Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquaks
each year.
Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.
The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big
ones typically occur along the edges of Earth’s tectonic plates.
Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover
our planet's
surface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When
riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一
about the same speed as sour fingernails grow.
But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although
less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples
rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the
quakes occurred and when similar ones nught occur.

Big earthquakes of a magnitude 8 or higher seldom happen far from the edges of tectonic plates.
A:Right
B:Wrong
C: Not mentioned

参考答案

参考解析
解析：由文章第一段第三句话“Oklahoma is not an area of the country famous for its quakes.”可 知，俄克拉荷马州不是美国以地震多发而扬名的州，故应选B。
由文章第一段最后一句话“But the most dangerous type of natural disasters, and also the most unpredictable, is the earthquake”可知，应选A。
由文章第二段第二句中“people don' t feel many of the tremors because they happen in re- mote and unpopulated regions”可知，在发生的多次地震中，只有很少的会被人们感觉到，因为多 数的地震都发生在遥远的无人区，故选B。
文章第四段中仅仅提到了地震仪能够监测到地震导致的地面震颤的面积和科学家们 用这种仪器所监测到的地震数目，故选C。
由文章第五段最后两句的内容可知，8级或更高的大地震多发于地壳构造板块的边缘， 故选A。.
由文章第六段第四句“When plates jostle and scrape past each other earthquakes occur." 以及常识可知，地壳板块只有在相互推挤和摩擦时地震才会发生，并不是任何一次的板块移 动都会导致地震，故选B。
文章最后一段中提到，两个世纪前几次最强的板块中部地震袭击了美国东半部地区， 但文中只说这些是已知的地震中最强的几次，并未表明这几次地震中的某一次地震是历史上 最强的，故选B。第3部分：概括大意与完成句子
更多 “共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Big earthquakes of a magnitude 8 or higher seldom happen far from the edges of tectonic plates.A:RightB:WrongC: Not mentioned” 相关考题
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth ' s crust（地壳）slide past each other. When these pieces slip , the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre-dict how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however,ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62 percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than 84 percent of thecity's buildings are old and weak.Analyses suggest that another massive earthquake would cause extensive damage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Big One will hit.It's just a mat- ter of when.The highest speed of fault ruptures in the 1906 quake was more than 3.5 kilometers per second.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Few earthquakes happen without people'S awareness.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.The earthquake is the most unpredictable natural disaster.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.The earthquake that hit the eastern half of the United States two centuries ago is the biggest"mid-plate" one in history.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Oklahoma is an area often experiencing natural disasters.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Big earthquakes of a magnitude 8 or higher seldom happen far from the edges of tectonic plates.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Seismometers can identify and locate most of the earthquakes in China.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth ' s crust（地壳）slide past each other. When these pieces slip , the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre-dict how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however,ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62 percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than 84 percent of thecity's buildings are old and weak.Analyses suggest that another massive earthquake would cause extensive damage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Big One will hit.It's just a mat- ter of when.San Francisco is fully prepared for another big earthquake.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Whenever tectonic plates move,earthquakes happen.A:RightB:WrongC:Not mentioned
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考题 共用题干 Study Helps Predict Big Mediterranean Quake1.Scientists have found evidence that an overlooked fault in the eastern Mediterranean is likely to produce an earthquake and tsunami every 800 years as powerful as the one that destroyed Alexandria in AD 365.2.Using radiocarbon dating techniques,simulations and computer models,the researchers recreated the ancient disaster in order to identify the responsible fault."We are saying there is probably a repeat time of 800 years for this kind of earthquake,"said Ms Beth Shaw,an earthquake scientist at the University of Cambridge,who led the study. Scientists study past earthquakes in order to deter-mine the future possibility of similar large shocks.3.Identifying the fault for the AD 365 earthquake and tsunami is important for the tens of millions of people in the region,Ms.Shaw said.The fault close to the southwest coast of Crete last produced a big enough quake to generate a tsunami about 1300,which means the next powerful one could come in the next 100 years,she added in a telephone interview.4.Ms.Shaw and her colleagues calculate the likely intervals by measuring the motion of either side of the fault to find how often such large earthquakes would have to occur to account for that level of motion,she said.Their computer model suggested an 8 magnitude quake on the fault would pro-duce a tsunami that floods the coastal regions of Alexandria and North Africa,the southern coast of Greece and Sicily all the way up the Adriati to Dubrovnik.This would be similar to the ancient quake in AD 365 that caused widespread destruction in much of Greece and unleashed a tsunami that flooded Alexandria and the Nile Delta likely killing tens of thousands of people,she said. Ms.Shaw measured the movement of either side of the fault to identify the magnitude of the earthquake taking place in AD 365.A:Right B:Wrong C:Not mentioned
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考题 共用题干 Study Helps Predict Big Mediterranean Quake1.Scientists have found evidence that an overlooked fault in the eastern Mediterranean is likely to produce an earthquake and tsunami every 800 years as powerful as the one that destroyed Alexandria in AD 365.2.Using radiocarbon dating techniques,simulations and computer models,the researchers recreated the ancient disaster in order to identify the responsible fault."We are saying there is probably a repeat time of 800 years for this kind of earthquake,"said Ms Beth Shaw,an earthquake scientist at the University of Cambridge,who led the study. Scientists study past earthquakes in order to deter-mine the future possibility of similar large shocks.3.Identifying the fault for the AD 365 earthquake and tsunami is important for the tens of millions of people in the region,Ms.Shaw said.The fault close to the southwest coast of Crete last produced a big enough quake to generate a tsunami about 1300,which means the next powerful one could come in the next 100 years,she added in a telephone interview.4.Ms.Shaw and her colleagues calculate the likely intervals by measuring the motion of either side of the fault to find how often such large earthquakes would have to occur to account for that level of motion,she said.Their computer model suggested an 8 magnitude quake on the fault would pro-duce a tsunami that floods the coastal regions of Alexandria and North Africa,the southern coast of Greece and Sicily all the way up the Adriati to Dubrovnik.This would be similar to the ancient quake in AD 365 that caused widespread destruction in much of Greece and unleashed a tsunami that flooded Alexandria and the Nile Delta likely killing tens of thousands of people,she said. Scientists predict that the next powerful earthquake in the eastern Mediterranean may take place some time before 2100.A:Right B:Wrong C:Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.The earthquake that hit the eastern half of the United States two centuries ago is the biggest“mid-plate” one in history.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Seismometers can identify and locate most of the earthquakes in China.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Oklahoma is an area often experiencing natural disasters.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Few earthquakes happen without people's awareness.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Big earthquakes of a magnitude 8 or higher seldom happen far from the edges of tectonic plates.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Whenever tectonic plates move,earthquakes happen.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Few earthquakes happen without people’s awareness.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.The earthquake that hit the eastern half of the United States two centuries ago is the biggest"mid-plate"one in history.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.The earthquake is the most unpredictable natural disaster.A:RightB:WrongC:Not rnentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.San Francisco is fully prepared br another big earthquake.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Oklahoma is an area often experiencing natural disasters.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Seismorneters can identify and locate most of the earthquakes in China.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.The highest speed of fault ruptures in the 1906 quake was more than 3.5kiiometors per second.A:RightB:WrongC:Not mentioned
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考题 共用题干 Moderate Earthquake Strikes EnglandA moderate earthquake struck parts of southeast England on 28 April 2007,toppling chim- neys from houses and rousing residents from their beds .Several thousand people were left without power in Kent County. One woman suffered minor head and neck injuries.“It felt as if the whole house was being slid across like a fun-fair ride,”said the woman.The British Geological Survey said the 4 .3-magnitude quake struck at 8:19 a.m. and was centered under the English Channel,about 8 .5 miles south of Dover and near the entrance to the Channel Tunnel.Witnesses said cracks appeared in walls and chimneys collapsed across the county .Residents said the tremor had lasted for about 10 to 15 seconds.“I was lying in bed and it felt as if someone had just got up from bed next to me.”said Hen-drick van Eck,27,of Canterbury about 60 miles southeast of London.“I then heard the sound of cracking,and it was getting heavier and heavier. It felt as if someone was at the end of my bed hopping up and down.”There are thousands of moderate quakes on this scale around the world each year,but they are rare in Britain. The April 28 quake was the strongest in Britain since 2002 when a 4.8-magni-tude quake struck the central England city of Birmingham.The country's strongest earthquake took place in the North Sea in 1931,measuring 6.1 on the Richter scale.British Geological Survey scientist Roger Musson said the quake took place on 28 April in an area that had seen several of the biggest earthquakes ever to strike Britain,including one in 1580 that caused damage in London and was felt in France.Musson predicted that it was only a matter of time before another earthquake struck this part of England.However,people should not be scared too much by this prediction,Musson said,as the modern earthquake warning system of Britain should be able to detect a forthcoming quake and announce it several hours be-fore it takes place .This would allow time for people to evacuate and reduce damage to the mini-mum. The following statements are true Except______.A: the quake caused a power failure in Kent CountryB: the tremor lasted for 10～15 secondsC: people in Canterbury felt strong quakeD: the quake was centered under the Channel Tunnel
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