verb (past and past participle underthrust)[with object]
- 1Force (a crustal plate or other body of rock) beneath another formation: the Farallon plate was being underthrust beneath the North American plate (as noun underthrusting) this sediment may be deformed by the underthrustingMore example sentences
- Patterns of this type can be readily explained by accretionary tectonism, whereby a packet of sediment accreted at the toe of the prism is underthrust and buried beneath an overburden of older strata.
- Here the Papua New Guinea continental crust appears to be underthrusting the adjacent marginal basin and obduction of the ophiolite is occurring in an uphill direction.
- The tensional stresses in the uplift can be relaxed by, for example, underthrusting in a subduction zone, or contraction in surrounding regions.
nounBack to top
- An instance of one crustal plate or other body of rock being forced underneath another: the westward underthrust of the Pacific Ocean plateMore example sentences
- We suggest that because the upper portion of underthrust sections lacked any thick, water-saturated clastic deposits this did not favour the formation of melanges.
More definitions of underthrustDefinition of underthrust in:
- The US English dictionary