Determination of the Upper Mantle Structure Beneath Southern California Using Long-Period Love and Rayleigh Waves Recorded at TERRAscope Stations

这项研究是利用TERRAscope（最近由加州理工学院在南加州安装的超宽带地震网络）记录的长周期表面波来确定南加州的相速度。一种完善的方法将应用于这些现代高质量的数据。由于数据质量有限，以前测量的周期范围限于27秒。新的数据集将周期范围扩展到150秒。增加的时间对于探测深层结构（即200公里深度）是至关重要的。更好地了解上地幔的这些深层结构，将有助于理解控制南加州目前发生的地震活动和构造变形的动力学。这项研究是国家减少地震危害计划的一个组成部分。

This research is to use long-period surface waves recorded at the TERRAscope (the very-broadband seismic network recently installed in southern California by the California Institute of Technology) to determine phase velocities in southern California. A well established method will be applied to these modern high-quality data. The period range of the previous measurements was limited to 27 seconds because of the limited quality of data. The new data set will extend the period range to 150 seconds. The increased period is critically important for exploring deep structures, that is, to a depth of 200 km. A better knowledge of these deep structures in the upper mantle will help understand the dynamics that controls the seismic activity and tectonic deformation presently taking place in southern California. This research is a component of the National Earthquake Hazard Reduction Program.