Two major earthquake zones threaten the United States in very different ways: Cascadia, off the Pacific Northwest, and New Madrid, buried beneath the Mississippi Valley. Cascadia could trigger five ...

The video below is a small-scale demonstration of something almost impossibly large: how a megathrust earthquake can suddenly turn the ocean into a weapon. The basic mechanics are frighteningly simple ...

The Sunda Megathrust stretches roughly 3,400 miles beneath the Indian Ocean and produced the magnitude 9.1 earthquake that ...

Add Yahoo as a preferred source to see more of our stories on Google. Three-and-a-half hours. That's how long Washington's coast would have before a tsunami arrives if a magnitude 9.2 earthquake ...