On the geoelectric structure of major strike-slip faults and shear zones

Details On the geoelectric structure of major strike-slip faults and shear zones On the geoelectric structure of major strike-slip faults and shear zones

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ep%26s...56.1177u&link_type=abstract

Earth, Planets and Space, Volume 56, p. 1177-1184.

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Scientific paper

Magnetotelluric imaging of the San Andreas Fault has shown that seismically-active segments are characterized by a zone of low resistivity in the upper crust. Similar resistivity features are observed on other major strike-slip faults, and may have a common origin in a region of fractured rock, partially or fully saturated with groundwater. Other strike-slip faults show possible zones of reduced resistivity in the mid and lower crust that may be related to zones of ductile shear. Additional MT surveys are required to elucidate the role of fluids in controlling the seismic behaviour of major faults, both in and below the seismogenic zone. A set of synthetic inversions show that MT data is sensitive to the geoelectric structure of a shear zone at mid-crustal depths.

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