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seaquake

[see-kweyk] /ˈsiˌkweɪk/
noun
1.
an agitation of the sea caused by a submarine eruption or earthquake.
Origin
1670-1680
1670-80; sea + (earth)quake
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for seaquake

seaquake

/ˈsiːˌkweɪk/
noun
1.
(obsolete) an agitation and disturbance of the sea caused by an earthquake at the sea bed. It is now usually described as an earthquake
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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seaquake in Science
seaquake
  (sē'kwāk')   
An earthquake originating under the ocean floor. Seaquakes are caused by shifting of the tectonic plates at the bottom of the ocean. The seabed pushes and pulls on the water above it, sending violent pressure waves toward the surface and often creating tsunamis.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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