Three primary sources of information can be used to answer the question "Could It Happen Here? Tsunamis That Have Struck U.S.
In 2005, the President's tsunami-warning initiative directed $37.5 million to the USGS and NOAA to improve the Nation's domestic tsunami detection and warning system.
Tsunamis are ocean waves triggered by large earthquakes that occur near or under the ocean, volcanic eruptions, submarine landslides, and by onshore landslides in which large volumes of debris fall into the water.
Although earthquake magnitude is one factor that affects tsunami generation, there are other important factors to consider. The earthquake must be a shallow marine event that displaces the seafloor.
Although both are sea waves, a tsunami and a tidal wave are two different and unrelated phenomena. A tidal wave is the wave motion of the tides.
For information on tsunami science and hazard mitigation: