seaquake

seaquake

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

Origin:
1670–80; sea + (earth)quake

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Collins
World English Dictionary
seaquake (ˈsiːˌkweɪk)
 
n
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 10th Edition
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American Heritage
Science Dictionary
seaquake   (sē'kwāk')  Pronunciation Key 
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.
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