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Natural Disasters

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TSUNAMIS

* 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 * The 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 waves * Particularly 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 which are highly variable (hard thing to predict) * To reduce tsunami impacts, planting of trees can be very useful * Causes of tsunamis – ALL involve displacement of water * Earthquakes * Mainly vertical crustal movements * In general, the larger the quake, the larger the tsunami…but NOT a perfect correlation * Another contributing factor to large tsunamis may be submarine landslides generated by the shaking associated with the earthquake causes additional displacement of water, thus a larger and more complicated tsunami event * Volcanic Activity * Displacement of rock * Submarine caldera

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