History of Tsunami

Tsunami occur most frequently in the Pacific Ocean, but are a global phenomenon; they are possible wherever large bodies of water are found, including inland lakes, where they can be caused by landslides. Very small tsunami, non-destructive and undetectable without specialized equipment, occur frequently as a result of minor earthquakes and other events.
Japan is the nation with the most recorded tsunami in the world. The earliest recorded disaster was the tsunami associated with the A.D. 684 Hakuho Earthquake. The number of tsunami in Japan totals 195 over a 1,313 year period, averaging one event every 6.7 years, the highest rate of occurrence in the world. These waves have hit with such violent fury that entire towns have been destroyed.
The destruction of much of Alexandria on August 21, A.D. 365 is presently attributed to a tsunami. In the witness account collected soon afterward by Ammianus Marcellinus (in his “Roman history”, book 26) all the typical features of a tsunami can be recognized: “The sea was driven back, and its waters flowed away to such an extent that the deep sea bed was laid bare, and many kinds of sea creatures could be seen.Many ships were therefore stranded as if on dry land, and many people wandered freely gathering fish and similar creatures huge masses of water flowed back when least expected, and now overwhelmed and killed many thousands of people.Some great ships were hurled by the fury of the waves on to roof tops (as happened at Alexandria) and others were thrown up to two miles from the shore”

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