Crustal structure across the San Andreas Fault at the SAFOD site from potential field and geologic studies

Details Crustal structure across the San Andreas Fault at the SAFOD site from potential field and geologic studies Crustal structure across the San Andreas Fault at the SAFOD site from potential field and geologic studies

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112s03m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12S03

Mathematics

Logic

12

Geodesy And Gravity: Local Gravity Anomalies And Crustal Structure, Geomagnetism And Paleomagnetism: Magnetic Anomaly Modeling, Structural Geology: Fractures And Faults

Scientific paper

We present newly compiled magnetic, gravity, and geologic datasets from the Parkfield region around the San Andreas Fault Observatory at Depth (SAFOD) pilot hole in order to help define the structure and geophysical setting of the San Andreas Fault (SAF). A 2-D cross section of the SAF zone at SAFOD, based on new, tightly spaced magnetic and gravity observations and surface geology, shows that as drilling proceeds NE toward the SAF, it is likely that at least 2 fault bounded magnetic slivers, possibly consisting of magnetic granitic rock, serpentinite, or unusually magnetic sandstone, will be encountered. The upper 2 km of the model is constrained by an order of magnitude increase in magnetic susceptibility at 1400 m depth observed in pilot hole measurements. NE of the SAF, a flat lying, tabular body of serpentinite at 2 km depth separates two masses of Franciscan rock and truncates against the SAF.

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