Kirchhoff Coda Migration of Regional Network Data

9614874 Revenaugh这项研究涉及通过将基尔霍夫偏移反演技术应用于当地地震数据来绘制地壳散射体的地图。目前的研究已经成功地使用了三种不同的散射模式来证明该方法的有效性。1)地形引起的P散入RG，横波不均匀引起的RG散布；2)俯冲板引起的P-P散射；3)断裂带非均匀引起的P-S散射，时间上可能与发震时间有关。这项工作将涉及对偏移技术的修改，以更好地模拟高频波的传播，包括方位变化的散射强度和场地响应，并在旅行时间计算中使用最新的层析模型。将使用加利福尼亚州、夏威夷和华盛顿州西部地震台阵的数据。这些结果与地震危险性填图、火山危险性填图和地壳上地幔结构有关。这项研究是国家减少地震灾害计划的一部分。***

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. ***