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

这项研究是以前NSF资助的一个逻辑延伸。 支持安装钻孔地震仪阵列， 能够看到并精确定位帕克菲尔德的小事件 位于加州的圣安德烈亚斯断层的一部分。 所得 事件波形数据库是油井的主要资源， 对断层的校准研究。 该研究针对 理解地震频谱的重要问题，因此， 地震的动力学和三维/时间衰减 在断层带和相关区域可见。 的区域 异常衰减则与 地震的时空发生在圣安德烈亚斯。 这项研究是一个重要的组成部分帕克菲尔德 在一个仪器密集的地区进行实验， 预测在不久的将来会发生6级地震。 的 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.