GEOL105 Lecture 8: Waves
1 Mar 2017
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Document Summary
Wind wave: energy mainly on the surface, periods: typically, 10 seconds, wavelength: typically, 150m (~500 ft. , height: typically, 1-3 meters (~ 3-10 feet) Moves the entire depth of the ocean (often several kilometers deep: periods: minutes to hours, wavelength: several hundred km, height: a few meters in deep ocean. Travel speeds from 500 to 1,00 km/h (315-625 mi/h) Water piles up at a wave front. Speed slows to 72 km/h (45 mph) Long wavelength = onshore flow for several minutes. There will be several surges of varying heights over many hours. Important for developing warnings and knowledge of tsunami. 159 people, including many school children, were killed. This led to the formation of the pacific tsunami warning center: located in hawaii itself. Generated by m9. 5 chilean quake: hit hilo hawaii 15 hours later, warning issued, but first wave was small thus people thought danger had passed, 10 m (35 feet) caught people unaware.
