underthrust

[ uhn-der-thruhst ]

noun

, Geology.

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

underthrust

/ ˈʌndəˌθrʌst /

noun

1. 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 surface Compare overthrust

Word History and Origins

Origin of underthrust¹

First recorded in 1890–95; under- + thrust