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Heat flow in the SAFOD pilot hole and implications for the strength of the San Andreas Fault

Geophysical Research Letters

By:
, , and
DOI: 10.1029/2003GL019352

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Abstract

Detailed thermal measurements have been acquired in the 2.2-km-deep SAFOD pilot hole, located 1.8 km west of the SAF near Parkfield, California. Heat flow from the basement section of the borehole (770 to 2160 m) is 91 mW m-2, higher than the published 74 mW m -2 average for the Parkfield area. Within the resolution of the measurements, heat flow is constant across faults that intersect the borehole, suggesting that fluid flow does not alter the conductive thermal regime. Reanalysis of regional heat flow reveals an increase in heat flow along the SAF northwest of Parkfield. This transition corresponds to a shallowing base of seismicity and a change in fault behavior near the northern terminus of the M6 1966 Parkfield earthquake rupture. The persistence of elevated heat flow in the Coast Ranges to the west appears to rule out frictional heating on the SAF as the source of the SAFOD value.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Heat flow in the SAFOD pilot hole and implications for the strength of the San Andreas Fault
Series title:
Geophysical Research Letters
DOI:
10.1029/2003GL019352
Volume
31
Issue:
15
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters