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seaquake

[see-kweyk]
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noun
  1. an agitation of the sea caused by a submarine eruption or earthquake.

Origin of seaquake

First recorded in 1670–80; sea + (earth)quake
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for seaquake

seaquake

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

seaquake in Science

seaquake

[sēkwāk′]
  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.