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Compression Directions in Southern California

Last updated:  April 9, 1997
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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:

Lower hemisphere stereographic projections of borehole elongation directions from all borehole studied, separated according to geographic region:

More Detailed Data for Each Borhole Studied