GG231 Chapter Notes - Chapter 4: Submarine Landslide, Subduction, Ath
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Chapter 4 tsunamis gg231 module 1. In the open ocean tsunami waves are about 200 km apart and their height is less than 1 meter. Nea(cid:396) the sho(cid:396)e they (cid:271)e(cid:272)o(cid:373)e a lot highe(cid:396), (cid:396)ea(cid:272)h (cid:1005)(cid:1004)"s of (cid:373)ete(cid:396)s high. Displacement of seafloor occurs when a (cid:271)lo(cid:272)k of ea(cid:396)th"s (cid:272)(cid:396)ust (cid:373)o(cid:448)es (cid:396)apidly up o(cid:396) do(cid:449)(cid:374) du(cid:396)i(cid:374)g an earthquake. Takes a quake of m 7. 5 or larger to make a tsunami. 4 stage process: displacement of sea floor caused by earthquake sets waves in motion in every direction, tsunami moves rapidly in deep ocean (720km/hr) but the waves are only about 1meter high and. When 1 wave overtakes another, a steep wall of water called a bore can be created. A tsunami is not one large wave, it is many large waves and can last several hours. The run up is the max horizontal and vertical distances that the largest wave reaches as it travels inward.
