Modeling Strong Motions from the Northridge Earthquakes

9416340 Helmberger 这项研究旨在从宽带、高性能 TERRAscope 波形数据以及 USGS-Caltech 短周期阵列的位置中获取余震源信息。 源固定后，将检查传播效应，以便为圣费尔南多地区开发更好的速度模型和相关的格林函数。 因此，较大的事件和主震可以使用这些格林函数重新反演滑移分布。 在此过程中，该地区的 3D 速度模型将得到极大改进，可用于评估整个洛杉矶地区的危险。 该项目是对国家地震减灾计划的贡献，并得到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. ***