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In 1991 and 1992, temperature and thermal conductivity data were acquired from five borehole strainmeter exploratory pilot holes and one borehole strainmeter installation hole drilled near the southern segment of the Hayward fault. The locations of these six holes (Lake Chabot, Walpert Ridge above Niles Canyon, Coyote Hills, Garin Park, and Sunol Ridge) cover a 20 km by 30 km gap in existing heat flow data between the southern San Francisco Peninsula segment of the San Andreas fault and the northern segment of the Hayward fault. Although thermal disturbances due to locally rugged topography and shallow groundwater flow are substantial at all but the Coyote Hills site, reliable conductive heat flow measurements have been obtained from four of the six holes. Heat flow is 83.3 ± 6.6 mW/m2 at Lake Chabot, 80.0 ± 15.0 mW/m2 at Niles Canyon (two holes), and 96.3 ± 2.5 mW/m2 at Coyote Hills. Incomplete data suggest that heat flow is greater than 80 mW/m2 at Garin Park. These new values are similar to an 84 mW/m2 value measured in the Berkeley Hills to the north and an average of 89.2 mW/m2 from six sites on the southern San Francisco Peninsula. This places the Hayward fault well within the region of elevated heat flow that characterizes most of the California Coast Ranges. In addition, if these measurements reflect near steady-state thermal conditions at depth, temperatures in the crust and upper mantle beneath the Hayward fault are indistinguishable from those beneath the Peninsula segment of the San Andreas fault.

Heat-flow measurements in the vicinity of the Hayward Fault, California