At the Seismological Society of America's Annual Meeting, researchers posed a seemingly simple question: how wide are faults?

A powerful earthquake shook many countries in Central America on Tuesday, with a magnitude of 6.5. The quake shook much of Central America late on Tuesday evening, from Nicaragua to Guatemala ...

Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake that follows a larger one ...

Earthquake of Magnitude 5.5 Strikes Near Coast of Central Chile ... Tags: earthquakes, Chile, South America ...