Tsunami - Tsunami 1 Tsunami(seismic sea wave an abnormally...

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Tsunami 1. Tsunami(seismic sea wave) : an abnormally long wavelength wave produced by sudden displacement of water 2. Near Field Tsunami : tsunami that strikes areas adjacent to its point of origin 3. Far Field Tsunami : tsunami that strikes areas distant from its point of origin (ex. Indonesia tsunami) (usually bigger and more damaging that near field) Tsunami Wave 1. Long wavelengths (ex. 400 km long with amp of 50 cm 2. Velocity dependent of water depth 1. The wave is so big that there is frictional interaction with the ocean bottom 2. Eave slows down in shallower water 1. Wave increases its height as the water become more shallow near the coast 2. As wave gets closer to shore (shallow) slows down increases in height , wall of water Velocity of Tsunami 1. C= sq rt (gD) C – velocity in metres per second G - gravitational acceleration (9.8) D – Depth in meters 1. Depends on water depth and gravity 2. Near shore tsunamis are much slower (112 km/h) less velocity 1. Storm Surge – not as forceful 2. Tsunami – forces of waves pushed up making it run up further inland (run-up height of 30-60 m even hundreds of metres) Tsunami Hazards
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1. Lack of warning : difficult to disseminate information btw and within countries (which authorities to call?) 2. Multiple Waves
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This note was uploaded on 03/26/2011 for the course EARTH SC 2gg3 taught by Professor Sonneberg during the Spring '11 term at McMaster University.

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Tsunami - Tsunami 1 Tsunami(seismic sea wave an abnormally...

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