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

1890–95; under- + thrust

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World English Dictionary
underthrust (ˈʌndəˌθrʌst)
geology Compare overthrust 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

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Example sentences
The shovel at lower right indicates the location of underthrust fault in the alluvium.
These fractures developed into faults that may have accommodated strain caused by the high topography of the underthrust ridge.
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