COLLABORATIVE RESEARCH: Mechanics of Footwall Uplift DuringDetachment Faulting

浅倾滑脱断层下剥蚀下盘岩石的均衡隆起被认为是造成滑脱向上拱起的原因，并可能导致断层的浅层过去被抛弃。该理论预测，随着断层滑动的继续，断层陡、活动部分和浅、不活动部分之间的铰链带将通过下盘迁移。替代模型预测下盘岩石中将记录不同的应变路径。本研究将通过考察来自不同构造背景的三个拆离断层下盘岩石的应变状态来验证迁移铰链带的假设：犹他州比弗坝山脉；惠普尔山脉，加利福尼亚；以及阿尔卑斯山东部的布伦纳线。研究结果将有助于评估迁移铰链模型，并将广泛适用于各种构造环境中的伸展带。

Isostatic uplift of denuded footwall rocks beneath a shallowly-dipping detachment fault is thought to cause upwards arching of the detachment and may cause the shallow past of the fault to be abandoned. This theory predicts that as fault slip continues, the hinge zone between steep, active and shallow, inactive parts of the fault will migrate through the footwall. Alternative models predict different strain paths will be recorded in the footwall rocks. This study will test the hypothesis of a migrating hinge zone by examining the strain state in footwall rocks beneath three detachment faults from different tectonic settings: Beaver Dam Mountains, Utah; Whipple Mountains, California; and Brenner Line, eastern Alps. The results will allow assessment of the migrating hinge models and will have broad applicability to extensional zones in a variety of tectonic environments.