EARTHSC 2GG3 Lecture 4: 4- Tsunamis
16 Sep 2016
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Document Summary
Tsunamis tsunami is japanese for harbour wave they are produced by the sudden displacement of water events capable of triggering tsunamis: earthquakes that causes uplift of the seafloor, landslides, volcano flank collapse, submarine volcanic eruptions, meteorites. Japan odds to have it within 7 years. 2011 same magnitude, diff results because it"s a developing country. Stage 3: as the tsunami approaches land, the water depth decreases (land starts to rise, this results in the water piling up" and causes these effects: A decrease in speed (front waves are slowing down first) A decrease in spacing of the waves. An increase in wave amplitude (decreasing volume so water rises) Types of tsunamis distant tsunami: a tsunami that travels thousands of kilometers across the open ocean. Regions at risk coasts located near subduction zones or across ocean basins from subduction zones are most at risk areas at greatest risk are the pacific ocean and the mediterranean sea.
