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

这项研究旨在开发和测试解决断层面模糊性问题的方法，即从地震初动得到的断层面解无法分辨出两个正交面中的哪一个是实际的断层面。这项研究将使用当地记录的、宽带、高动态范围的数字地震图进行，这些数字地震图来自加利福尼亚州安扎的卡韦拉震群数字地震阵列。由于震源大小有限，整个体波的宽带地震能量应该具有一定的方向性信息。来自便携式地震系统的数据也将被分析，这些系统记录了埃尔西诺尔和圣哈辛托断裂带之间的震群。这项研究是国家减少地震灾害计划的一部分。

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.