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The High Resolution Seismic Network (HRSN) is operated by the Berkeley Seismological Laboratory at the University of California at Berkeley. The HRSN is an array of borehole instrumentation deployed in the Parkfield area, with the goal of monitoring microseismicity on the San Andreas fault. For current HRSN network information as well as individual station pages, please see the Berkeley Seismological Lab's HRSN pages.The HRSN has the network code BP.