Reassessment of the 1906 San Andreas Fault Rupture in Portola Valley, California, from Synthesis of Lidar and Historical Data

2013 ◽  
Vol 103 (4) ◽  
pp. 2404-2423
Author(s):  
C. T. Wrucke ◽  
R. T. Wrucke ◽  
T. Sayre
Keyword(s):  
Historical Data ◽  
San Andreas Fault ◽  
Fault Rupture ◽  
San Andreas

Deformation of railroad tracks by slippage on the Hayward fault in the Niles District of Fremont, California

1966 ◽  
Vol 56 (2) ◽  
pp. 281-289
Author(s):  
M. G. Bonilla
Keyword(s):  
San Andreas Fault ◽  
Average Rate ◽  
Lateral Shift ◽  
Annual Rate ◽  
Fault Rupture ◽  
Average Annual Rate ◽  
Short Intervals ◽  
Railroad Tracks ◽  
San Andreas

abstract Slippage (also called creep) on the Hayward fault has produced a right-lateral shift of about 0.7 feet in three sets of railroad tracks that were built 55 and 56 years ago. The average annual rate of 0.15 inch per year is about one-third the average rate of slippage on the San Andreas fault, but the rate has been much greater during short intervals. The zone of acute deformation of the tracks is 20 to 80 feet wide; the tracks are underlain by unconsolidated deposits more than 300 feet thick. Surface faulting at this locality in the 1868, and probably in the 1836, earthquake suggests that the processes of fault rupture and fault slippage can alternate at the same locality.

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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