Structural fabric of the Geysers
Conference
·
OSTI ID:602786
- Energy and Geoscience Institute, Salt Lake City, UT (United States)
A consistent means for comparing regional fracturing with that in The Geysers geothermal system was achieved using Thematic Mapper (TM) images. Linear features were defined by line traces that were bounded by disappearance or changes in strike, and the data was analyzed to document both trace length and strike. Using a Geographic Information System (GIS) the fracture trends are analyzed with respect to both the production zone and the Clear lake volcanic province as defined by heat flow. Statistical analysis of the data shows that the fracture pattern over the production zone is distinct from the regional fracture pattern. It is often stated that the principal strike-slip faults that bound the geothermal system are parallel the San Andreas fault system; however, their orientation is 10{degrees} to 30{degrees} more westerly. In addition, the northeast Cobb Creek and east-west Anderson Creek trends are strongly represented over the geothermal system. A major zone of fracturing extends from Pt. Arena to the east and passes through The Geysers. We propose that this zone reflects the location of the Mendocino Fracture Zone at approximately 3 Ma. The Geysers hydrothermal-magmatic system appears to be controlled by this family of faults and is located in the area of maximum flexure. Dextral strike-slip motion across this flexure resulted in northwest-southeast extension to the north and compression to the south.
- DOE Contract Number:
- AC07-95ID13274
- OSTI ID:
- 602786
- Report Number(s):
- CONF-971048--
- Country of Publication:
- United States
- Language:
- English
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