Tsunamis pose a risk to the entirety of the California coast. But should a major one strike, how bad could it be?

Research into Thera's tsunami is ongoing. The largest earthquake ever measured ... to an international data and warning network for the first time. It uses hundreds of seismic stations worldwide ...

While no known tsunamis have ever reportedly affected the Gulf Coast of Florida, a tsunami in that location is not impossible. A large rogue wave, not to be confused with an official tsunami ...

A look back at the horrible loss of life. In photos A woman mourning a relative killed in the tsunami in Cuddalore, India, on Dec. 28, 2004.Credit...Arko Datta/Reuters Supported by Text by Hannah ...