EARTHSC 2GG3 Lecture 3: Lecture 3-Tsunamis
25 Dec 2016
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Document Summary
They are produced by the sudden displacement of water. Earthquakes that cause uplift of the seafloor(majority) 2 indonesia due to building structures etc. (don"t need to remember dates) By displacement of the seafloor - by triggering a landslide that enters water. Generally, an earthquake must be of at least m 7. 5 in order to trigger a tsunami. Don"t typically see tsunamis in atlantic ocean( m 6 mostly in atlantic) Displacement of the seafloor sets waves in motion that transmit energy outward and upward. When the waves reach the surface of the water, they spread outward. In the deep ocean, the waves move rapidly (they can reach speeds of over 500 km/h, nothing to slow them down). The spacing of the wave crests(peak of each wave) is very large(it can be more than 100km) The height (amplitude) of the waves is often small (less than 1 m).
