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南部大盆地地震台网区域的三维地震速度结构，有效覆盖内华达州南部。该技术包括从局部事件和远震中反演P和S地震波的传播时间。地质填图显示，上地壳伸展是非均匀的，高度伸展的地体与几乎未伸展的地体相邻。这种伸展如何在中、下地壳和上地幔中表现出来仍然存在争议。这一分析预计将解决大约10公里大小的结构元素到大约300公里的深度。这一分析与盆岭省深部活动正断层的性质有关。这项研究是国家减少地震危害计划的一个组成部分。

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.