Many tsunamis are initiated by landslides that displace large amounts of water. These include rockfalls and avalanches, such as the huge avalanche that triggered a 200-foot- (60-m-) high tsunami in Lituya Bay, Alaska. Submarine landslides tend to be larger than avalanches that originate above the water line, and they have generated some of the largest tsunamis on records. Many submarine landslides are earthquake-induced, whereas others are triggered by storm events and by increases in pressure on the sediments on the continental shelf induced by rises in sea level.
Continue reading here: The 1958 Lituya Bay Alaska Tsunami
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