moonquake

moonquake

[moon-kweyk]
noun
a seismic vibration of the moon's surface.

Origin:
1935–40; moon + (earth)quake

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World English Dictionary
moonquake (ˈmuːnˌkweɪk)
 
n
a light tremor of the moon, detected on the moon's surface

Collins English Dictionary - Complete & Unabridged 10th Edition
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