Investigation into the Historic Seismicity of Central California

小行星9506622 这项研究是为了将分析加州南部和中部大地震的现代技术延伸到只有模拟地震记录的历史时期。 虽然这些地区中的许多地区目前都很平静，特别是在圣安德烈亚斯断层附近，但那里发生了几次历史性的大地震，这些地震对估计地震危险性很重要。 加州寿命最长的地震台站是伯克利BRK和MHC（自1887年以来），以及加州理工学院PAS和SBC（自1927年以来）。 此外，还将从其他地区和欧洲大陆的观测站获得地震图，如荷兰的De Bilt和密苏里州的Florissant观测站。 该技术涉及使用现代网络记录的最近地震与历史数据进行比较，以获得相对位置，震级缩放，并校准每个站点的路径。 由此产生的校准绿色的功能将被用来模拟历史事件的源深度，标量地震矩，断层方向和潜在的源复杂性在较大的历史地震。 这项研究是国家地震减灾计划的一个组成部分。 ***

9506622 DREGER This research is to extend modern techniques of analysis of large earthquakes in southern and central California back to historical times when only analog seismographic recordings were available. While many of these regions are currently quiet, especially off of the San Andreas fault, several historic large earthquakes have occurred there and these are important to the estimation of seismic hazard. The longest-lived seismic stations in California are the Berkeley BRK and MHC (since 1887), and the Caltech PAS and SBC (since 1927) stations. In addition, seismograms will be obtained from other regional and teleseismic sites such as the De Bilt, Netherlands and the Florissant, Missouri observatories. The technique involves the use of recent earthquakes recorded by modern networks to compare with the historic data to obtain relative locations, magnitude scaling, and to calibrate paths to each station. The resulting calibrated Green's functions will be used to model the historic events for source depth, scalar seismic moment, fault orientation and potential source complexity in the larger historic earthquakes. This research is a component of the National Earthquake Hazard Reduction Program. ***