SAFOD is motivated by the need to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. SAFOD drilled and instrumented an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source. 

Keywords: North America, USA, Parkfield, San Andreas Fault, Active Faulting, California, Directional Drilling, Downhole Monitoring, Earthquakes