scholarly journals Local magnetic field variations and stress changes near a slip discontinuity on the San Andreas fault.

1978 ◽  
Vol 30 (5) ◽  
pp. 511-522 ◽  
Author(s):  
M. J. S. JOHNSTON
Keyword(s):  
Magnetic Field ◽  
San Andreas Fault ◽  
Local Magnetic Field ◽  
San Andreas ◽  
Stress Changes ◽  
Magnetic Field Variations

scholarly journals Coevolving early afterslip and aftershock signatures of a San Andreas fault rupture

2021 ◽  
Vol 7 (15) ◽  
pp. eabc1606
Author(s):  
Junle Jiang ◽  
Yehuda Bock ◽  
Emilie Klein
Keyword(s):  
San Andreas Fault ◽  
Three Dimensional ◽  
Time Span ◽  
Structural Factors ◽  
Fine Scale ◽  
Fault Rupture ◽  
Zone Structure ◽  
San Andreas ◽  
Stress Changes ◽  
Large Earthquakes

Large earthquakes often lead to transient deformation and enhanced seismic activity, with their fastest evolution occurring at the early, ephemeral post-rupture period. Here, we investigate this elusive phase using geophysical observations from the 2004 moment magnitude 6.0 Parkfield, California, earthquake. We image continuously evolving afterslip, along with aftershocks, on the San Andreas fault over a minutes-to-days postseismic time span. Our results reveal a multistage scenario, including immediate onset of afterslip following tens-of-seconds-long coseismic shaking, short-lived slip reversals within minutes, expanding afterslip within hours, and slip migration between subparallel fault strands within days. The early afterslip and associated stress changes appear synchronized with local aftershock rates, with increasing afterslip often preceding larger aftershocks, suggesting the control of afterslip on fine-scale aftershock behavior. We interpret complex shallow processes as dynamic signatures of a three-dimensional fault-zone structure. These findings highlight important roles of aseismic source processes and structural factors in seismicity evolution, offering potential prospects for improving aftershock forecasts.

The San Andreas Fault

1993 ◽  
Author(s):  
Sandra S. Schulz ◽  
Robert E. Wallace
Keyword(s):  
San Andreas Fault ◽  
San Andreas
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