EARTHSC 2GG3 Chapter Notes - Chapter 8: Pacific Tsunami Warning Center, Cascadia Subduction Zone, Tsunami Warning System
29 Dec 2019
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Document Summary
Wind waves: smaller individual waves with troughs between - you can see the difference in height. Velocity depends on the period of wave. Water particles rotate in place similar to passage of seismic waves. Slow as they approach land due to friction from the bottom of the ocean. Interference with the orbital motions, bottom flattens into elliptical and horizontal motions. Waves slow, wavelengths decreases so wave grows higher. When wave height to length ratio reaches 1:7, wave topples forward as a breaker. Tsunami waves: huge mass of water with tremendous momentum - solid body. Wave height is the leading edge of sheet of water flows on land form minutes. Usually a series of waves separated by 10-60 minutes. Water can retreats into the tsunami wave. Dangerous because 1m3 of water weighs 1 ton. Seismic stations measure depth of water passing over: water pressure sensors at the bottom of the ocean and floating.
