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 tsunamis cannot be prevented, the impact of a tsunami can be mitigated through community preparedness, timely warnings, and effective response.
NOAA Ocean Today has a set of four videos that explain how scientists track tsunamis and how you can be prepared for one.