Modeling Strong Motions from the Northridge Earthquakes

9416340 Helmberger这项研究是从宽带、高性能的TERRASCORM波形数据中获得余震源信息，并结合美国地质调查局-加州理工短周期台阵的位置。在源固定的情况下，将检查传播效应，以便为圣费尔南多地区建立更好的速度模型和相关的格林函数。因此，可以使用这些格林函数对较大的事件和主震进行滑移分布的重新反转。在这一过程中，该地区的三维速度模型将得到极大的改进，并可用于评估整个扩展的洛杉矶地区的危险。该项目是对国家减少地震灾害计划的贡献，并得到了北岭地震紧急拨款的支持。***

9416340 Helmberger This research is to obtain aftershock source information from the broad-band, high capability TERRAscope waveform data in conjunction with the locations from the USGS-Caltech short-period array. With the sources fixed, propagational effects will be examined to develop better velocity models and associated Green's functions for the San Fernando region. Thus, the larger events and mainshock can be re-inverted for slip-distributions using these Green's Functions. In the process, the 3-D velocity model of the region will have greatly improved and can be used to assess hazards throughout the extended Los Angeles region. This project is a contribution to the National Earthquake Hazard Reduction Program and is supported by the Northridge Earthquake Emergency Appropriation. ***