EASC 104 Lecture Notes - Wave Base, Wavelength, Orbit
27 Dec 2012
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Document Summary
A tsunami is not a tidal wave. Orbital motion versus depth at half of the wave length there is no movement of water there is no movement at the wave base. When there is no more wave base, it starts to drag along the bottom of the ocean floor and decreases the velocity of the wave and increases in height. If you are in a tsunami but in deep water, you will not feel or see much. The vertical fault movement of the fault is what triggers a tsunami. In a strike slip fault, we are not likely to trigger a tsunami. Most tsunamis are triggered by a reverse fault because of the hanging wall. If there is sediment build up at a delta, then there is a small landslide off that delta. During volcanic eruptions, a slope collapse down into the water which causes a wave and water is displaced which can trigger a tsunami.
