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Along strike variations in the electrical structure of the San Andreas Fault at Parkfield, California
Author(s) -
Unsworth Martyn,
Bedrosian Paul,
Eisel Markus,
Egbert Gary,
Siripunvaraporn Weerachai
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011476
Subject(s) - san andreas fault , magnetotellurics , geology , seismology , electrical resistivity and conductivity , wedge (geometry) , fault (geology) , geometry , electrical engineering , mathematics , engineering
Magnetotelluric exploration has been used to image along strike variations in the electrical resistivity structure of the San Andreas Fault at Parkfield, California. A low resistivity wedge extending to a depth of several kilometers is continuous over a horizontal distance of 8 km. The base of the wedge is coincident with the shallowest microearthquakes. A change in the electrical and fluid connection of the San Andreas Fault with a low resistivity zone in the Franciscan formation is observed along the Parkfield segment.