BIOL1300 Lecture 45: February 25_Environmental Geoscience II_Elizabeth Follett
29 May 2017
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Lecture 17: tsunami ii last class: tsunami i. Tsunamis have very long wavelengths (100-1000 km), much longer than water depth. Underwater fault displaced water above sea level. Wind waves have shorter wavelengths and last for less time. They act like shallow water waves, even when they are in the open ocean. Move quickly through the open ocean because water depth is very deep. The disturbance is present throughout the entire water column. Left figure: would not know there is a wave if you were at the ocean floor. Way to detect tsunami: pressure sensors at faults in ocean floor tsunami approach to land. Tsunamis have a relatively small amplitude in the deep ocean. The amplitude of the tsunami increases as the tsunami approaches shore (just as in wind-generated waves) Will start to break as they get larger and approach land. Lituya bay in glacier bay national park.
