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The Largest Recorded Tsunami Was 50 Years Ago

An anonymous reader writes "July marks the 50th anniversary of the world's largest tsunami — a 1,720-foot-tall wave in Lituya Bay, Alaska. It was triggered by a chain reaction of events that began with a magnitude 7.7 earthquake on the Fairweather Fault, which dislodged a rock fall of 40 million cubic yards, that fell 3,000 feet and splashed into the northwest end of Lituya Bay to generate the wave. This article includes survivor accounts, maps, a satellite image, and photos taken right after the event." To be fair, eyewitness accounts put the height of the wave as it came toward their boats at perhaps 100 feet. The tsunami scoured the land of vegetation and soil to a height of 1,720 feet above sea level, however.

6 of 323 comments (clear)

  1. Re:Feet and yards? by jedie · · Score: 4, Informative

    from TFA

    "The force of the wave removed all trees and vegetation from elevations as high as 1720 feet (524 meters) above sea level. This is the highest wave that has ever been known."

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  2. Re:Feet and yards? by Eddi3 · · Score: 4, Informative

    5,280 feet.

  3. Similar tsnumai will devastate Eastern Seaboard by xannik · · Score: 4, Informative

    This type of tsunami is the exact same as what is predicted will ultimately wipe out most of the Eastern Seaboard. It will make Katrina and even the tsunami that hit in the Indian Ocean look like a cake walk. http://www.guardian.co.uk/uk/2004/aug/10/science.spain

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  4. Re:Feet and yards? by radio4fan · · Score: 5, Informative

    I blame women. No woman wants to go from weighing 95 units to weighing 209 units.

    Great theory, but there are 2.2lbs in a kilo, not 2.2kg in a lb.

    So a 95lb woman weighs about 43kg, not 209kg.

  5. Re:The eye witness account... by Drogo007 · · Score: 4, Informative

    If you look at the map of the damage, the 1725 figure comes from the slope directly opposite where the honking huge chunk of rock fell 3000' feet to land in the water - which probably displaced all the water straight up and over the spur where the 1725 figure was recorded and then damage along the rest of the bay was more in line with the 100' figure.

  6. Re:Metric bah by gnuman99 · · Score: 4, Informative

    1 liter is a volume of 10cm x 10cm x 10cm.