Magnitude 7.3 quake triggered tsunami warning in Alaska. There are hardly any earthquakes on the East Coast. Does that mean ...

Though rare, a powerful undersea landslide or seismic event could trigger a mega-tsunami capable of devastating the U.S. East Coast—putting millions of lives and critical infrastructure at risk.

Near-shore tsunamis, those triggered by earthquakes just off the coast, could pose a particularly dire risk for California’s heavily populated coastal communities.