INDUCED SEISMICITY MECHANISM AT THE GEYSERS, CALIFORNIA.
By: David Oppenheimer
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Abstract
Induced microearthquake activity at The Geysers geothermal reservoir is observed in the vicinity of eight geothermal steam power units. The earthquakes do not align with mapped faults but occur adjacent to steam wells. The sense of motion as deduced from focal mechanisms is strike-slip to reverse in the upper 1 km of the reservoir and changes to strike-slip to oblique normal slip at greater depth because of the increased lithostatic load. Below 1 km the reservoir is undergoing horizontal extension. Alignment of P and T axes with the regional stress field suggests that contraction of the reservoir contributes the incremental stress perturbation to the regional stress field and causes microearthquakes.
Suggested Citation
Oppenheimer, D., 1985, INDUCED SEISMICITY MECHANISM AT THE GEYSERS, CALIFORNIA., in Transactions - Geothermal Resources Council, v. 9, no. pt 2, Kailua-Kona, HI, USA, p. 41-44.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | INDUCED SEISMICITY MECHANISM AT THE GEYSERS, CALIFORNIA. |
| ISBN | 093441260X |
| Volume | 9 |
| Issue | pt 2 |
| Year Published | 1985 |
| Language | English |
| Publisher | Geothermal Resources Council |
| Publisher location | Davis, CA, USA |
| Larger Work Title | Transactions - Geothermal Resources Council |
| First page | 41 |
| Last page | 44 |
| Conference Title | 1985 International Symposium on Geothermal Energy. Geothermal Resources Council 1985 Annual Meeting. |
| Conference Location | Kailua-Kona, HI, USA |