EARTHSC 2GG3 Lecture Notes - Burma Plate, Wind Wave, Plate Tectonics
1 Apr 2013
School
Department
Course
Professor
Document Summary
Tsunami(seismic sea wave) : an abnormally long wavelength wave produced by sudden displacement of water. Near field tsunami: tsunami that strikes areas adjacent to its point of origin. Far field tsunami: tsunami that strikes areas distant from its point of origin (ex. Indonesia tsunami) (usually bigger and more damaging that near field) 400 km long with amp of 50 cm. The wave is so big that there is frictional interaction with the ocean bottom. Wave increases its height as the water become more shallow near the coast. As wave gets closer to shore (shallow) slows down increases in height, wall of water. Near shore tsunamis are much slower (112 km/h) less velocity. Tsunami forces of waves pushed up making it run up further inland (run-up height of 30-60 m even hundreds of metres) Lack of warning: difficult to disseminate information btw and within countries (which authorities to call?)
