Page "lore" Paragraph 606
from
Brown Corpus
A tsunami is not a single wave but a series.
The waves are separated by intervals of 15 minutes to an hour or more ( because of their great length ), and this has often lulled people into thinking after the first great wave has crashed that it is all over.
The waves may keep coming for many hours.
Usually the third to the eighth waves in the series are the biggest.
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