GEOG 1350 Lecture 3: Geography 1350 3rd Lecture
9 Dec 2018
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Document Summary
They are produced by the sudden displacement of water. Events capable of triggering tsunamis: earthquakes that cause uplift on the sea floor (cause 85%, landslides, volcano flank collapse, submarine volcano eruption, meteorites. Earthquakes can cause tsunamis in 2 ways: displacement of the sea floor, triggering a landslide that enters the water. Generally, an earthquake must be at least a m 7. 5 in order to trigger a tsunami. Stage 1: displacement of the seafloor sets waves in motion that transmit energy outwards and upwards, 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 in the water piling up and causes these effects: 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 distance that the largest wave of a tsunami reaches as it travels inland.
