Geography 2152F/G Lecture 3: hazards lec 3
3 Nov 2017
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Tsunamis: tsunami is japanese for (cid:498)harbour wave(cid:499), they are produced by the sudden displacement of water, events capable of triggering tsunamis: Earthquakes that cause uplift of the seafloor: landslides, volcano flank collapse, underwater volcanic eruptions, meteorites. No warning for the indian ocean but had one for the pacific ocean. Stage 1: displacement of the seafloor sets waves in motion that transmit energy upward and outward, when the waves reach the surface of the water, they spread outward. Tsunami event: a tsunami event consists of a series of large waves reaching shore that can last for several hours, run-up, the maximum vertical distance that the largest wave of a tsunami reaches as it travels inland. Regions at risk: coasts located near subduction zones or across oceans from subduction zones are most at risk, areas at greatest risk are the pacific ocean and the mediterranean sea.
