NOAA - Tsunami
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A tsunami is a series of ocean waves generated by sudden displacements in the sea floor, landslides, or volcanic activity. In the deep ocean, the tsunami wave may only be a few inches high. The tsunami wave may come gently ashore or may increase in height to become a fast moving wall of turbulent water several meters high.
Although a tsunami cannot be prevented, the impact of a tsunami can be mitigated through community preparedness, timely warnings, and effective response.
NOAA has primary responsibility for providing tsunami warnings to the Nation, and a leadership role in tsunami observations and research.
New! Honshu Event, March 11, 2011