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EARTH SCIENCE > HUMAN DIMENSIONS > NATURAL HAZARDS > TSUNAMIS

Definition:
A wave train, or series of waves, generated in a body of water by an impulsive disturbance that vertically displaces the water column. Earthquakes, landslides, volcanic eruptions, explosions, and even the impact of cosmic bodies, such as meteorites, can generate tsunamis. Tsunamis can savagely attack coastlines, causing devastating property damage and loss of life.

Reference:
University of Washington Department of Earth and Space Sciences