COLLABORATIVE RESEARCH: Mechanics of Footwall Uplift DuringDetachment Faulting: A Field Test of Kinematic and Dynamic Models

地壳下剥蚀下盘岩石的均衡抬升 浅倾拆离断层被认为是导致向上 分离的破坏，并可能导致浅过去的 错误被抛弃。 这一理论预测随着断层的滑动 继续，陡峭，活跃和浅之间的铰链区， 断层的不活跃部分将通过下盘迁移。 替代模型预测将记录不同的应变路径 在下盘岩石中 这项研究将测试一个假设， 通过检查下盘应变状态迁移铰链带 三条不同构造背景的拆离断层下的岩石 设置：比弗坝山脉，犹他州;维普莱山脉， 加州和阿尔卑斯山东部的布伦纳线。 结果将允许 评估迁移的枢纽模型，并将有广泛的 适用于各种构造中的伸展带 环境.

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.