Natural Disasters

May 1st, 2015
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A tsunami is a very long ocean wave generated by sudden displacement of the sea floor or of the oceanic mass The displacement of an equivalent volume of water generates the tsunami A tsunami is harmless until it approaches the coastline

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Natural DisastersBy ergood18 | Studymode.comTSUNAMISA tsunami is a very long ocean wave generated by sudden displacement of the sea floor or of the oceanic mass The displacement of an equivalent volume of water generates the tsunami A tsunami is harmless until it approaches the coastlineThe most prone areas are those associated with earthquakes and volcanoes (mainly subduction zones) Compared to normal ocean waves which may be about 100m, the wavelengths of large tsunami waves can exceed 200km Tsunamis travel very quickly relative to normal ocean wavesParticularly the case in open water where velocities increase with water depth Distant: As a wave propagates across the ocean, there is time to warn people Local: But in a subduction zone where the tsunami is generated, there is very little warning time (15-30 minutes) In shallow water, the tsunami waves pile up as a result velocities and wavelengths decrease, but at the same time, amplitudes can increase enormously Due to its long wavelength, it may take a long time for a tsunami wave to crest Wave runup depends on several factors water depth, sea floor profile, shape of the coastline Leads to wave heights whic

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