Geography 2152F/G Lecture 3: Lesson 3-1
17 Feb 2022
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They are produced by the sudden displacement of water. Earthquakes that cause uplift of the seafloor. By triggering a landslide that enters water. Generally, an earthquake must be of at least m 7. 5 to trigger a tsunami. Displacement of the seafloor sets waves in motion that transmit energy upward and outward. When the waves reach the surface of the water, they 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. The height (amplitude) of the waves is often small (less than. Passengers on ships in the ocean rarely even notice tsunamis passing beneath them. As the tsunami approaches land, the water depth decreases. This results in the water piling up" and causes these effects: A decrease in spacing of the waves. As the tsunami impacts land, waves can reach heights of dozens of metres.
