Compression Directions in Southern California

Last updated: April 9, 1997

Comments to

wilde@gps.caltech.edu or jstock@gps.caltech.edu

These are results of observations from deviated boreholes in Southern California (from Santa Barbara to Los Angeles Basin). Borehole elongation in drill holes was used to infer breakout orientation and directions of maximum horizontal principal stress [Wilde and Stock, 1997]. These results are broadly consistent with results from focal mechanism studies [Hauksson, 1990] as well as breakout and focal mechanism data present in the world stress map database [Zoback, 1992]. Click on one of the next choices to see:

  • MAP OF SOUTHERN CALIFORNIA showing stress directions from Wilde and Stock (1997), from Zoback (1992), and Mount and Suppe (1995).

  • MAP OF UPPER OJAI VALLEY AREA only

  • MAP OF LOS ANGELES AREA only

    LOWER HEMISPHERE STEREOGRAPHIC PROJECTIONS OF BOREHOLE ELONGATION DIRECTIONS from all borehole studied , separated according to geographic region:

    MORE DETAILED DATA FOR EACH BOREHOLE STUDIED

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