Mapping the Spatial Distribution of the Origin of High Frequency Seismic Energy from Extended Faults

这项研究是将地震断层破裂面的研究扩展到更高频率的辐射，超过3赫兹。在这个范围内，由于地球的复杂性，波形反演已被证明是不切实际的，因此已经开发了一种使用地震波能量包络的程序。该技术利用强震图在扩展断层上定位高频能量源。初步结果表明，高频能量源位于大滑移带边界沿线或附近。这支持了一个假设，即高频最强烈地产生于断裂停止区或滑动变化较大的地区，这对地震危险性估计有影响。目前的工作将把分析扩展到更多的地震。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 extend the study of earthquake fault rupture surfaces to higher frequency radiation, above 3 hertz. In this range, waveform inversion has proven impractical due to earth's complexities and a procedure has been developed using seismic wave energy envelopes. The technique locates high frequency energy sources on extended faults by means of strong motion seismograms. Preliminary results indicate that the high frequency energy sources are located along or near the boundaries of large slip zones. This supports the hypothesis that high frequencies are most strongly generated from rupture stopping areas or areas with large slip variation, which has implications for earthquake hazard estimates. The current work will extend the analysis to more earthquakes. This research is a component of the National Earthquake Hazard Reduction Program.