Parallel fault strands at 9-km depth resolved on the Imperial Fault, Southern California

Details Parallel fault strands at 9-km depth resolved on the Imperial Fault, Southern California Parallel fault strands at 9-km depth resolved on the Imperial Fault, Southern California

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..19s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 14, pp. 19-1, CiteID 1674, DOI 10.1029/2002GL015302

Physics

5

Seismology: Earthquake Parameters, Seismology: Seismicity And Seismotectonics, Tectonophysics: Rheology-Crust And Lithosphere

Scientific paper

Precision relocation of hundreds of small earthquakes occurring along the Imperial Fault in Southern California during the last two decades reveals parallel steaks of seismicity at 9-km depth. These strands are spaced about 0.5 km apart within a 2 km wide zone of earthquakes near the brittle-ductile transition between the shallow locked part of the fault and a creeping zone at depth. These results suggest that the lower crustal shear zone below the Imperial Fault, site of major earthquakes in 1940 and 1979, must be at least two kilometers wide.

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