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.

An earthquake rattled much of the Northeast on Friday morning, with shaking felt across the New York City metropolitan area and in communities from Baltimore and Philadelphia up through New England.

Earthquakes are becoming increasingly frequent. On Sunday morning, four earthquakes struck parts of India, Myanmar, and Tajikistan within just one hour, sending tremors across central and South Asia.

(WHTM) — Residents in Pennsylvania felt shaking Friday morning as a 4.8 magnitude earthquake struck New Jersey. Earthquake reported in New Jersey, tremors felt in Pennsylvania One of the most commonly ...

Often in these weekly Night Sky columns I refer to the magnitude of a star or planet. The concept of magnitude is relatively easy to grasp. Put simply, magnitude indicates an object’s degree of ...

A strong, 6.3-magnitude earthquake struck in Venezuela on Wednesday, according to the United States Geological Survey. It ...

A minor, 3.3-magnitude earthquake struck in the San Francisco Bay Area on Monday, according to the United States Geological ...