Across‐Fault Velocity Gradients and Slip Behavior of the San Andreas Fault Near Parkfield
نویسندگان
چکیده
منابع مشابه
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 ...
متن کاملSteep-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...
متن کاملSlip 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 ...
متن کاملVariations of the velocity contrast and rupture properties of M6 earthquakes along the Parkfield section of the San Andreas fault
S U M M A R Y We investigate the seismic velocity contrast across the San Andreas fault (SAF) in the Parkfield area using fault zone head waves (FZHW) that propagate along the bimaterial fault interface and direct P waves. We systematically analyse large data sets of near-fault waveforms recorded by several seismic networks over the period 1984–2005. Clear FZHW are observed at many stations on ...
متن کاملPostseismic relaxation along the San Andreas fault at Parkfield from continuous seismological observations.
Seismic velocity changes and nonvolcanic tremor activity in the Parkfield area in California reveal that large earthquakes induce long-term perturbations of crustal properties in the San Andreas fault zone. The 2003 San Simeon and 2004 Parkfield earthquakes both reduced seismic velocities that were measured from correlations of the ambient seismic noise and induced an increased nonvolcanic trem...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2020
ISSN: 0094-8276,1944-8007
DOI: 10.1029/2019gl084480