Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30psde5p&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 16, pp. SDE 5-1, CiteID 1842, DOI 10.1029/2003GL017689
Physics
2
Physical Properties Of Rocks: Magnetic And Electrical Properties, Seismology: Seismic Hazard Assessment And Prediction, Structural Geology: Fractures And Faults, Structural Geology: Role Of Fluids
Scientific paper
A previous interpretation of a high resolution magnetotelluric profile across the San Andreas fault at Parkfield attributed an anomalously conductive region just west of the fault and extending to depths of 3 km to fractured rock saturated with brines. Laboratory measured electrical resistivities of samples of sedimentary rocks known to border the fault to the east are comparable to resistivities of the anomalous zone. We suggest that the anomalous region results from conductive sedimentary rocks in a plunging syncline that is adjacent to the fault, rather than caused by fractured rock. If correct, the current surface trace of the San Andreas fault at Middle Mountain does not form the boundary between the Salinian block and the North American plate. Instead, that boundary is ~1 km west and collocated with current seismicity.
Park Stephen K.
Roberts Jeffery J.
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