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A geological event caused by shifting tectonic plates, triggered by a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported. Magnitudes of 3 or lower are mostly imperceptible; magnitudes of 7 or more cause serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale
Cause of death Direct trauma due to collapse of buildings, dehydration, shock, crush injury
References in periodicals archive ?
How might that affect the number of earthquakes striking the U.
Scientists routinely use seismometers to monitor for seismic waves released by earthquakes.
To see whether past earthquakes had ever pushed volcanoes over the brink, Linde and Sacks scoured global records dating back as far as the 1500s.
is celebrating its San Francisco heritage with a special exhibit commemorating the 100th anniversary of the 1906 earthquake.
SACRAMENTO - Earthquake insurance rates for most California homeowners would drop by an average 22 percent next year under a proposal recommended Thursday by the California Earthquake Authority.
But in the winter of 1811 and 1812, a series of three massive earthquakes shook the area surrounding New Madrid, Mo.
Now Hutton spends most of her time locating earthquakes and assigning magnitudes.
We are offering the 800 number as one way to help people turn their concern and fear of earthquakes into constructive actions.
The 2006 IINC poll also found that less than half of Californians consider themselves prepared for an earthquake.
Nobody knows what happens if gas hydrates get shaken by earthquakes," says Okal.
On the twelfth anniversary of the Northbridge earthquake and 100 years after the calamitous 1906 San Francisco earthquake, The Wall Street Transcript is pleased to dedicate a session at its Commercial Real Estate -- Due Diligence Conference to the Risks and Ramifications of Earthquakes on Buildings.
That means the crust is thickening, raising hills and mountains, increasing the chance of earthquakes that are taking up the compression.