Earthquakes and seismic activity often happen with sudden movements underground with tectonic plates. Seismographs are used by scientists to measure the time, location and strength of an earthquake.
About 55 earthquakes a day – 20,000 a year – are recorded by the National Earthquake Information Center. Most are tiny and barely noticed by people living where they happen. But some are strong enough ...
Scientists measure both the energy released in an earthquake and its damage. In 1902, Italian scientist Giuseppe Mercalli introduced a scale that measures the intensity of an earthquake based on its ...
A minor, 3.5-magnitude earthquake struck in the San Francisco Bay Area on Thursday, according to the United States Geological ...
An earthquake of magnitude 5.4 on the Richter scale struck the Andaman Sea on Sunday afternoon, according to National Center ...
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