Kirchhoff Coda Migration of Regional Network Data

本研究涉及到将Kirchhoff偏移反演技术应用于局部地震资料，进行地壳散射体的映射。目前的研究已经成功地用三种不同的散射模式证明了该方法的有效性。1)地形因素导致P向Rg散射，横波非均质性导致Rg散射；2)俯冲板块造成的P - P散射；3)由于断裂带非均质性造成的P - S散射，可能与地震发生的时间有关。这项工作将包括改进迁移技术以更好地模拟高频波的传播，包括方位角变化的散射强度和地点响应，并在传播时间计算中使用最新的层析模型。来自加利福尼亚、夏威夷和华盛顿西部地震阵列的数据将被使用。结果与地震危险性图、火山危险性图和地壳上地幔构造有关。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊

9614874 Revenaugh This research involves the mapping of crustal scatterers by means of the application of Kirchhoff migration inversion techniques to local earthquake data. Current research has successfully emonstrated the effectiveness of the methodology using three different scattering modes. 1) P scattered into Rg due to topography and scattered Rg due to shear-wave heterogeneity; 2) P to P scattering due to a subducting slab; and 3) P to S scattering due to fault zone heterogeneity, presumably temporal in nature related to the timing of earthquake occurrence. This work will involve modification of the migration technique to better model high-frequency wave propagation, include azimuthally varying scattering intensity and site responses and use the latest tomographic models in the travel time calculations. Data from seismic arrays in California, Hawaii, and western Washington will be used. The results are related to earthquake hazard mapping, volcanic hazard mapping and crustal and upper mantle structure. This research is a component of the National Earthquake Hazard Reduction Program. ***