Mapping Azimuthal Anisotropy in the United States from LRSM Data

本研究是通过对S和SKS的综合分析，扩展美国当前的剪切波分裂数据，剪切波分裂使用来自20世纪60年代的远程地震监测（LRSM）网络的三分量短周期模拟数据。这些模拟数据将被数字化并提供给科学界，提供了一个具有成本效益和空间广泛的数据集，这将极大地促进美国各地地震各向异性的测绘，有效地将目前可用的测量值提高了四倍。横波分裂是地震各向异性的一种度量，可以用来推断与地幔流动有关的地幔应变，以及次大陆地幔变形与地壳变形之间的关系，地壳变形是地震发生的驱动力。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊

9506607 NI This research is to expand the current shear-wave splitting data in the U.S. through a comprehensive analysis of S and SKS, shear- wave splitting using the three-component short-period analog data from the Long Range Seismic Monitoring (LRSM) network which was in place during the 1960's. This analog data, which will be digitized and made available to the scientific community, presents a cost- effective and spatially extensive data set which will greatly facilitate mapping of seismic anisotropy across the U.S., effectively quadrupling the currently available measurements. Shear-wave splitting is a measure of seismic anisotropy which can be used to infer mantle strain associated with mantle flow and the relationship between subcontinental mantle deformation and crustal deformation, the driving force of earthquake occurrence. This research is a component of the National Earthquake Hazard Reduction Program. ***