A Collaborative Investigation to Determine the Three- Dimensional Elastic Wave Velocity Structure of the Crust and Upper Mantle Beneath the So. Great Basin

这项研究将涉及确定大盆地南部地震台网地区的三维地震速度结构，该地区有效地覆盖了内华达州南部。这项技术包括从当地事件和远震中反演P和S的地震波走时。地质图显示，上地壳的伸展是非常不均匀的，高度伸展的地体毗邻几乎没有伸展的地体。这种伸展是如何在中下地壳和上地幔中表现出来的，目前仍存在争议。这项分析预计将解决大小约10公里、深度约300公里的结构要素。这一分析与盆山地区深部活动正断层的性质有关。这项研究是国家减少地震灾害计划的一部分。

This research will deal with determination of the 3-D seismic velocity structure in the area of the Southern Great Basin Seismic Network, effectively covering southern Nevada. The technique involves inversion of P and S seismic wave travel times from local events and teleseisms. Geologic mapping reveals that the upper crustal extension has been quite heterogeneous, with highly extended terranes adjoining virtually unextended terranes. How this extension is manifested in the middle and lower crust and upper mantle remains in dispute. This analysis is expected to resolve structural elements of about 10 km size down to approximately 300 km depth. This analysis bears on the nature of active normal faulting at depth in the Basin and Range province. This research is a component of the National Earthquake Hazard Reduction Program.