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Compression Directions in Southern California

Santa Barbara Region

Figure 2a. Lower hemisphere stereographic projection of borehole elongation directions from boreholes studied in the Santa Barbara region. There is a dominant E-W trend of breakout azimuths at low borehole deviations, suggesting a N-S direction of compression. 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.