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underthrust
(redirected from underthrusting)

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underthrust [¦ən·dər¦thrəst]
(geology)
A thrust fault in which the lower, active rock mass has been moved under the upper, passive rock mass.


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The mantle reflections have been interpreted as subduction scars formed during Siluro-Dcvonian, west-directed underthrusting of Ganderia and Avalonia beneath Laurentia (van der Velden and Cook, 2002a).
However, the tremor occurred 40 to 50 kilometers below sea level and lasted only 50 seconds, making it deeper and quicker than other underthrusting quakes, Kanamori notes.
The latter occurs along sedimentary and structural-tectonic conduits such as unconformities, faults, and the decollement (the prominent boundary between the overriding and underthrusting plates shown in the figure on page 87) as well as through mud volcanoes.
 
 
 
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