Papers Published

1. Malin, Peter and Shalev, Eylon and Balven, Heather and Lewis-Kenedi, Catherine, Structure of the San Andreas Fault at SAFOD from P-wave tomography and fault-guided wave mapping, Geophysical Research Letters, vol. 33 no. 13 (2006), pp. 13314 - [2006GL025973] .
   (last updated on 2007/04/09)

   Abstract:
   Fault-guided waves reveal a low-velocity fault segment a few hundred meters southwest of the main strand of the San Andreas Fault (SAf) system. In 2004, the San Andreas Fault Observatory at Depth (SAFOD) Main Hole was drilled 2.5 km underground and 0.7 km west of the SAF surface trace. A 3-component, 4.5-Hz seismograph was installed near the bottom of this hole. This instrument recorded fault zone guided (Fg) waves originating from earthquakes along the main SAF [similar to] 2 km north and 3 km south of the SAFOD site. This [similar to] 5 km length corresponds to a distinctive low-velocity structure imaged in 2003 using microearthquakes recorded on the Pilot Hole array. Because this structure transmits Fg-waves from the main fault, it is probably connected to the main SAF and is most likely a major, unmapped fault. Copyright 2006 by the American Geophysical Union.

   Keywords:
   Seismic waves;Tomography;Drilling;Seismographs;Velocity measurement;Conformal mapping;