Geography 2152F/G Lecture 3: geo lecture 3
12 Oct 2016
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They are produced by the sudden displacement of water. By triggering a landslide that enters water (or you can have a landslide that can cause. Generally, an earthquake must be of at least m 7. 5 in order to rigger a tsunami tsunami) We don(cid:495)t get severe tsunamis in the atlantic. Displacement of the seafloor sets waves in motion that transmit energy upward and outward. When the waves reach the surface of the water, there is no where to go to, so they have to spread outward. The waves move rapidly across the open ocean (they can reach speeds of over 500 km/h). The spacing of the wave crests is very large (it can be more than 100 km) If we are moving at 500 km/h, every 12 minutes. The height (amplitude) of the waves is often small (less than 1 m). Passengers on ships in the ocean rarely even notice tsunamis passing beneath them.
