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Compression Directions in Southern California

Upper Ojai Valley

Figure 2b. Lower hemisphere stereographic projection of borehole elongation directions from boreholes studied in Upper Ojai Valley. Breakout direction is plotted as a solid line parallel to its trend in map view, at the position corresponding to the appropriate borehole trend and plunge. Breakouts considered most reliable for constraining the stress direction area those trending WNW. Radical directions observed at higher borehole deviations are most likley key seats rather than true breakouts.