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全国职称英语等级考试理工类试题
全国职称英语等级考试理工类试题

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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 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 — 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 . Geological Survey estimate that several million earthquakes rattle the globe each year. That may sound scary, but people
全国职称英语等级考试理工类试题
全国职称英语等级考试理工类试题
全国职称英语等级考试理工类试题
don ’ t feel many of the tremors because they happen in remo te and unpopulated regions. Many quakes happen under the ocean, and others have a very small magnitude, or shaking intensity.
全国职称英语等级考试理工类试题
全国职称英语等级考试理工类试题
全国职称英语等级考试理工类试题

A magnitude 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, ., and New York City (Wall Street shown), people crowded the streets while engineers inspected buildings. Credit: Wikimedia/Alex Tabak

Scientists know about small, remote quakes only because of very sensitive electronic devices called seismometers. These devices detect and measure the size of ground vibrations 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

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