Rock pulverization at high strain rate near the San Andreas fault

Crustal Strain Near the Big Bend of the San Andreas Fault: Analysis of the Los Padres-Tehachapi Trilateration Networks, California

Low-velocity damaged structure of the San Andreas Fault at Parkfield from fault zone trapped waves

[1] We used dense linear seismic arrays across and along the San Andreas Fault (SAF) at Parkfield, California to record fault zone trapped waves generated by explosions and microearthquakes in 2002. Prominent trapped waves appeared at stations close to the SAF main fault trace while some energy was trapped in the north strand at the array site. Observations and 3-D finitedifference simulations ...

Deep rock damage in the San Andreas Fault revealed by P- and S-type fault-zone-guided waves

Damage to fault-zone rocks during fault slip results in the formation of a channel of low seismic-wave velocities. Within such channels guided seismic waves, denoted by Fg, can propagate. Here we show with core samples, well logs and Fg-waves that such a channel is crossed by the SAFOD (San Andreas Fault Observatory at Depth) borehole at a depth of 2.7 km near Parkfield, California, USA. This l...

Steep-dip seismic imaging of the shallow San Andreas fault near Parkfield.

Seismic reflection and refraction images illuminate the San Andreas Fault to a depth of 1 kilometer. The prestack depth-migrated reflection image contains near-vertical reflections aligned with the active fault trace. The fault is vertical in the upper 0.5 kilometer, then dips about 70 degrees to the southwest to at least 1 kilometer subsurface. This dip reconciles the difference between the co...

Slip along the San Andreas Fault Associated with the Earthquake

_______________________________ 155 Introduction ______________________________ 155 Observations _______________________________ 155 Comparison with 1968 slippage __________________ 157 Similarities ______________________________ 157 Differences ________________________________ 157 Discussion ________________________________ 157 Acknowledgments -_________________________^_ 159 References cited ...