Megatsunami | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Megatsunami


00:01:46 1 Overview
00:03:54 2 Recognition of the concept of megatsunami
00:05:30 3 Analysis of mechanism
00:09:19 4 List of megatsunamis
00:09:29 4.1 Prehistoric
00:12:21 4.2 Historic
00:12:29 4.2.1 c. 2000 BC: Réunion
00:12:47 4.2.2 c. 1600 BC: Santorini
00:13:08 4.3 Modern
00:13:16 4.3.1 1792: Mount Unzen, Japan
00:13:45 4.3.2 1883: Krakatoa
00:14:18 4.3.3 1958: Lituya Bay, Alaska, US
00:14:59 4.3.4 1963: Vajont Dam, Italy
00:15:29 4.3.5 1980: Spirit Lake, Washington, US
00:16:37 5 Potential future megatsunamis
00:18:01 5.1 British Columbia
00:18:32 5.2 Canary Islands
00:22:43 5.3 Hawaii
00:25:04 5.4 Cape Verde Islands
00:25:27 6 See also



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SUMMARY
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A megatsunami is a very large wave created by a large, sudden displacement of material into a body of water.
Megatsunamis have quite different features from other, more usual types of tsunamis. Most tsunamis are caused by underwater tectonic activity (movement of the earth's plates) and therefore occur along plate boundaries and as a result of earthquake and rise or fall in the sea floor, causing water to be displaced. Ordinary tsunamis have shallow waves out at sea, and the water piles up to a wave height of up to about 10 metres (33 feet) as the sea floor becomes shallow near land. By contrast, megatsunamis occur when a very large amount of material suddenly falls into water or anywhere near water (such as via a meteor impact), or are caused by volcanic activity. They can have extremely high initial wave heights of hundreds and possibly thousands of metres, far beyond any ordinary tsunami, as the water is "splashed" upwards and outwards by the impact or displacement. As a result, two heights are sometimes quoted for megatsunamis – the height of the wave itself (in water), and the height to which it surges when it reaches land, which depending upon the locale, can be several times larger.
Modern megatsunamis include the one associated with the 1883 eruption of Krakatoa (volcanic eruption), the 1958 Lituya Bay megatsunami (landslide into a bay), and the wave resulting from the Vajont Dam landslide (caused by human activity destabilizing sides of valley). Prehistoric examples include the Storegga Slide (landslide), and the Chicxulub, Chesapeake Bay and Eltanin meteor impacts.