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.

YERINGTON, Nev. (News 4 & Fox 11) — Aftershocks could persist for weeks following a 5.8 magnitude earthquake that rattled much of northern Nevada and parts of California on Monday. The Nevada ...

A preliminary magnitude-3.3 earthquake was reported early Friday in Redlands. Refresh this page for updates. Did you feel it? Whether you feel shaking from an earthquake largely depends on three major ...

THE destructive power of earthquakes is measured in different ways, but the one most people have heard of is the Richter scale. Here’s how the force is calculated – and what it means if you are caught ...

A magnitude 3.9 earthquake struck just outside the city limits of Lake Elsinore on Thursday morning, the latest modest temblor to shake Southern California. Weak shaking may have been felt in areas ...