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 ...

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.

Back-to-back aftershocks — with preliminary magnitudes of 4.8 and 4.1 — jolted Southcentral Alaska around 12:45 p.m. Thursday, in case we weren’t already jumpy enough. Magnitude, according to the U.S.

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 ...

Compare the magnitudes of devastating earthquakes throughout history. See which Democrats broke ranks to fund the government ...

We know an earthquake is severe when it has a high magnitude number. The 1985 quake that devastated Mexico City was an 8. The quake that shook central Mexico this week was a 7.1. But what exactly is ...

Haiti on Saturday was struck by a powerful earthquake that by one measure was actually stronger than the devastating 2010 quake that turned much of the capital city of Port-au-Prince into rubble. The ...

Three low-intensity earthquakes within 24 hours hit In Pakistan's Karachi on Monday, with the first one being reported at around 1 am. As per the Pakistan Meteorological Department, the tremors were ...