SOC 2070 Lecture 3: Lecture 3
7 Dec 2016
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Document Summary
They are produced by the sudden displacement of water. Earthquakes can cause tsunamis in two ways: You need a magnitude 7. 5 or higher to trigger a tsunami. Tsunamis develop in a 4 stage process. Stage 1: 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. Stage 3: as the tsunami approaches land, the water depth decreases, this results i(cid:374) the (cid:449)ater (cid:858)pili(cid:374)g up(cid:859) a(cid:374)d (cid:272)auses these effe(cid:272)ts: A decrease in spacing of the waves. A tsunami event consists of a series of large waves reaching shore that can last for several hours. Run-up: the maximum horizontal and vertical distances that the largest wave of a tsunami reaches as it travels inland, the run up essentially describes the geographic area impacted by the tsunami.
