Monitoring Microearthquakes with the San Andreas Fault Observatory at Depth

P331 Monitoring Microearthquakes with the San Andreas Fault Observatory at Depth V. Oye* (NORSAR) & W.L. Ellsworth (USGS) SUMMARY In 2005 the San Andreas Fault Observatory at Depth (SAFOD) was drilled through the San Andreas Fault zone at a depth of about 3.1 km. The borehole has subsequently been instrumented with high-frequency geophones in order to better constrain locations and source processes of nearby microearthquakes that will be targeted in the upcoming phase of SAFOD. The microseismic monitoring software MIMO developed by NORSAR has been installed at SAFOD to provide near-real time locations and magnitude estimates using the high sampling