"It's fair to say that Alaska is California's biggest tsunami threat," said Michael West, director of Alaska Earthquake ...

A major earthquake off the coast of Alaska could trigger a tsunami flooding San Francisco's Embarcadero. But the main sensors designed to provide warnings for such a tsunami will soon go dark.

This week in iReport, we received compelling images and stories from major international natural disasters: a tsunami in the Samoan Islands and flooding in the Philippines from Typhoon Ketsana.

A 1,000-foot mega tsunami could devastate the US West Coast — and scientists say it's not a matter of if, but when. The ...