term properly applied to the crest of a tide
as it moves around the earth. The wavelike upstream rush of water caused by the incoming tide in some locations is known as a tidal bore
. In popular usage the term tidal wave also is often applied to any destructive wave or to high water not related to tidal phenomena. These latter waves are of two types: tsunamis
, which are waves caused by earthquakes
, and storm surges (see under storm
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