underthrust

[ uhn-der-thruhst ]
/ ˈʌn dərˌθrʌst /

noun Geology.

a thrust fault in which the footwall moved and the hanging wall did not (opposed to overthrust).

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Origin of underthrust

First recorded in 1890–95; under- + thrust
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for underthrust

underthrust
/ (ˈʌndəˌθrʌst) /

noun

geology a reverse fault in which the rocks on the lower surface of a fault plane have moved under the relatively static rocks on the upper surfaceCompare overthrust
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