RUI: Resolving Fault-Plane Ambiguity for Small Earthquakes Using Broadband Seismic Data

本研究旨在开发和测试解决断层面模糊问题的方法，即从地震的首次运动中得到的断层面解无法确定两个正交平面中哪一个是实际的断层面。这项研究将使用来自加州安扎的本地记录的宽带、高动态范围数字地震图，以及卡韦拉地震群的数字地震阵列。由于震源大小有限，完整体波的宽带地震能量应具有一定的指向性信息。来自便携式地震系统的数据记录了埃尔西诺和圣哈辛托断层带之间的地震群，这些数据也将被分析。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 develop and test methods for resolving the fault plane ambiguity problem, that is, the inability of fault plane solutions from first motions of an earthquake to resolve which of two orthogonal planes was the actual fault surface. The research will be done using locally recorded, broad-band, high dynamic range digital seismograms from the Anza, California, digital seismic array for the Cahuilla earthquake swarm. The broad-band seismic energy of the complete body waves should have some directivity information as a result of the finite source size. Data from portable seismic systems that recorded earthquake swarms between the Elsinore and San Jacinto fault zones will also be analyzed. This research is a component of the National Earthquake Hazard Reduction Program.