underthrust


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underthrust

(ˈʌndəˌθrʌst)
n
(Geological Science) 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
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References in periodicals archive ?
Saffer, "Pore pressure development and progressive dewatering in underthrust sediments at the Costa Rican subduction margin: comparison with northern Barbados and Nankai," Journal ofGeophysical Research: Solid Earth, vol.
Field evidence suggests that the fold developed during prograde metamorphism and penetrative deformation when the Indian plate was underthrust beneath Indus ophiolitic mElange (DiPietro and Lawrence, 1991).
The race this time is between Professor McGovern ("the underthrust of his learning could carry his conversation to the uplands of history") and Old Pro Nixon ("then his mind locked into tight reasoning").
"At once enthusiast and skeptic, public man and private intelligence, a creature of multiple moods and personae," Greenberg impressed Howe not so much because of "the positions he took but the variety of his tone, the cut of his argument, and insight along the way" punctuated by "suave and mordant ironies, and an underthrust of self-doubt." Maurice Samuel's 1953 eulogy also expressed admiration for a sagacity which was not derived from learning.
Located at an altitude of approximately 2,700 m in the rugged mountainous terrain of Enga province in the highlands of P.N.G., the Porgera intrusive system lies 24 km south of the Lagaip Fault which marks where the leading, northern edge of the Australian continental plate starts to underthrust the central mountain belt of P.N.G.