Earthquake danger is not limited to one familiar crack in California. Across the country, plate boundaries, buried rifts, and active fault systems sit near cities, coastlines, transportation corridors ...

Deep beneath the eastern Pacific Ocean about 1,000 miles off the coast of Ecuador, a fault line on the seafloor has been generating magnitude 6 earthquakes with almost clocklike regularity for at ...

The magnitude of an earthquake depends on how far a rupture travels along a fault line before it stops. For the first time, we have now directly observed how a large earthquake comes to a halt. By ...