Shear-Wave Splitting from Teleseismic Arrivals at Seismic Stations in the Basin and Range and the Transition to the San Andreas Fault, California

这项研究是为了进一步发展和证明各向异性引起的横波分裂现象，这是一个对板块构造和地球模型具有重要意义的主题。这项工作将绘制盆地和山脉下方地幔中橄榄石的路线，并向东延伸到圣安德烈亚斯断层。这将使研究人员能够研究加州的转换制度与盆地和山脉下方延伸之间的过渡，以及盆地和山脉过去和现在延伸方式之间的关系。该技术包括从远震距离的S、SKS和SCS震相记录中分析剪切波分裂，以测量地幔的速度各向异性，可能还有地壳的速度各向异性。剪切波分裂可能是孕震过程中的一种诊断，因此这项研究是对国家防震减灾计划的贡献。

This research is to further develop and document the phenomenon of shear-wave splitting due to anisotropy, a topic that has important implications for plate tectonics and models of the earth. The work will map the alignment of olivine in the mantle beneath the Basin and Range and eastward to the San Andreas Fault. This will allow the researchers to examine the transition between the transform regime in California and the extension beneath the Basin and Range, and the relation between the styles of past and present extension in the Basin and Range. The technique involves analyzing shear-wave splitting from recordings of S, SKS, and ScS phases of earthquakes at teleseismic distances to measure the velocity anisotropy of the mantle and possibly the crust. Shear-wave splitting may be a diagnostic in the process of preparation of earthquakes and this research is therefore a contribution to the National Earthquake Hazard Reduction Program.