GEOG 1350 Chapter 3: Tsunami's
10 Jan 2012
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Document Summary
Tsunami s are produced by the sudden displacement of ocean, lake or river water. Some causes of tsunami s are large earthquakes, landslides, explosive volcanic eruption, or an impact in the ocean of an asteroid or comet. Displaces the seafloor or the floor of a large lake, or by triggering a large landslide. When seafloor displaces a block of earth s crust moves rapidly up or down during an earthquake. (earthquake 7. 5 or higher to cause damaging tsunami) Upward or downward movement of the seafloor displaces the overlying water and initiates a four stage process. Four stage process: displacement of seafloor causes oscillatory waves transmitting energy outward and upward from source. Waves then intercept surface spreading outward: in deep ocean waves move more rapidly and farther apart. Velocity equals square root of the product of acceleration of gravity and water depth.
