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.

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 preliminary magnitude-3.6 earthquake was reported late Tuesday morning near Banning in Riverside County. Shaking was reported in Banning, Lake Elsinore, San jacinta, Yucaipa, Hemet, Palm Springs and ...

A 4.4-magnitude earthquake struck about 2.5 miles south of the Los Angeles neighborhood of Highland Park Monday, according to the U.S. Geological Survey. It was reported at about 12:20 p.m. and felt ...

A magnitude-2.5 earthquake shook the Charleston, South Carolina region just after 9:00 p.m. local time on Wednesday, centered ...

ATLANTA (AP) — A 4.1-magnitude earthquake in Tennessee woke up families and rattled homes as far away as Atlanta as it spread tremors across portions of the southern U.S. on Saturday morning. No ...

A magnitude-5.2 earthquake occurred near Julian, a small agricultural community in Southern California, at 10:08 a.m., according to the U.S. Geological Survey. Noticeable shaking could be felt across ...

More than a dozen aftershocks followed a 3.9-magnitude earthquake that struck the Inland Empire Saturday — a quake that was felt by many and reported just 30 minutes after a 3.5-magnitude quake ...

Experts fear that the quake in Turkey on Monday was strong and shallow enough to be lethal on a devastating scale. By Natasha Frost A quake that struck a densely-populated part of southeastern Turkey ...

KERN COUNTY, Calif. (KABC) -- A magnitude 5.2 earthquake struck in Kern County Tuesday night, with significant shaking felt throughout Southern California. The quake struck at 9:09 p.m. southwest of ...