A Study of High Frequency Seismic Wave Attenuation in the San Andreas Fault at Parkfield, CA

这项研究是美国国家科学基金会之前资助的安装一系列钻孔地震仪的合理延伸，这些地震仪能够看到并精确定位加州圣安德烈亚斯断层帕克菲尔德部分的小事件。由此产生的事件波形数据库是对断层进行良好校准研究的主要资源。该研究解决了理解地震频谱的重要问题，因此，地震的动力学和在断裂带和相关区域看到的三维/时间衰减。然后，异常衰减带将与圣安德烈亚斯地震的时空发生有关。这项研究是帕克菲尔德主要实验的一个组成部分，在一个仪器密集的地区，美国地质勘探局预测在不久的将来会发生6级地震。因此，该项目直接适用于国家减少地震灾害计划。

This research is a logical extension of previous NSF-funded support to install an array of borehole seismometers which are able to see and precisely locate small events on the Parkfield segment of the San Andreas fault in California. The resulting database of event waveforms is a prime resource for well- calibrated studies of the fault. The research addresses the important issue of understanding the seismic spectra and, hence, the dynamics of the earthquakes and the 3-D/temporal attenuation seen in the fault zone and associated regions. The zones of anomalous attenuation then will be related to the spatial/temporal occurrence of earthquakes on the San Andreas. This research is an integral part of the major Parkfield experiment in an area of intense instrumentation where the USGS has predicted a magnitude 6 earthquake in the near future. The project therefore has direct application to the National Earthquake Hazard Reduction Program.