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. Magnitude illustrates the strength of an earthquake ...

Japanese authorities issued a tsunami warning Monday afternoon after a powerful earthquake struck off the country’s northeastern coast.

A 7.7 magnitude earthquake shook northern Japan on Monday, elevating that country's risk advisory for a "mega-quake."

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 closest to the epicenter, which included Orange County ...

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 retired in 2023. Seismologists register the intensity ...

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. The quake had a magnitude of 4.8, according to the U.S ...