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A series of waves in a body of water (ocean, sea, lake, etc) that wreaks havoc on the coastlines of said body of water. Caused by displacement of the water, like throwing a rock into a pond; mostly caused by earthquakes, landslides, volcanic eruptions, the occasional asteroid/comet, anything that disrupts the water. Unlike ordinary waves, tsunami waves act more [like shock] waves from an explosion; they affect the whole water column from the surface to the sea floor and in the open sea travel as fast as an airliner. [In deep water], they hardly look different from normal waves, but as they approach the shore they slow down, their energy is compressed, and they turn into monsters: the water often drains from the beach, exposing the sea floor and stranding boats and sea animals (people should know that [this is a] warning to run like hell for high ground); then the first of a series of increasingly huge waves batter the coastline and sweep people inland, one wave coming in just as the previous [one is] draining away; finally, [the waves] drain back to sea, dragging debris and people with them and leaving the coast a mass of wreckage.
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