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.

There have been no immediate reports of damage or injuries and there is no tsunami warning.

What does “moment magnitude” mean, and how do scientists determine the strength of a rupture in the earth? By Henry Fountain Henry Fountain spent a quarter century covering science for The Times. He ...

A magnitude 7.0 earthquake struck off the coast of Tonga early Monday morning, prompting a tsunami warning that has since been lifted. The U.S. Geological Survey said that the earthquake hit about 62 ...

A 7.0 magnitude earthquake off of the California coast sent trembles Thursday morning throughout Northern California that uprooted homes from their foundations and cut power for thousands as a threat ...

A preliminary 5.2-magnitude earthquake struck near Bakersfield on Tuesday, sending shaking all the way to Los Angeles County. It happened at about 9:09 p.m. Tuesday, roughly 14.29 miles southwest of ...