Non-shear focal mechanisms of earthquakes at The Geysers, California and Hengill, Iceland, geothermal areas
By: B.R. Julian, A.D. Miller, and G.R. Foulger
Edited by: Anon
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Abstract
Several thousand earthquakes were recorded in each area. We report an initial investigation of the focal mechanisms based on P-wave polarities. Distortion by complicated three-dimensional crustal structure was minimized using tomographically derived three-dimensional crustal models. Events with explosive and implosive source mechanisms, suggesting cavity opening and collapse, have been tentatively identified at The Geysers. The new data show that some of these events do not fit the model of tensile cracking accompanied by isotropic pore pressure decreases that was suggested in earlier studies, but that they may instead involve combination of explosive and shear processes. However, the confirmation of earthquakes dominated by explosive components supports the model that the event are caused by crack opening induced by thermal contraction of the heat source.
Suggested Citation
Julian, B., Miller, A., Foulger, G., 1993, Non-shear focal mechanisms of earthquakes at The Geysers, California and Hengill, Iceland, geothermal areas, in Transactions - Geothermal Resources Council, v. 17, Burlingame, CA, USA, 10 October 1993 through 13 October 1993, p. 123-128.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Non-shear focal mechanisms of earthquakes at The Geysers, California and Hengill, Iceland, geothermal areas |
| ISBN | 0934412715 |
| Volume | 17 |
| Year Published | 1993 |
| Language | English |
| Publisher | Publ by Geothermal Resources Council |
| Publisher location | Davis, CA, United States |
| Larger Work Title | Transactions - Geothermal Resources Council |
| First page | 123 |
| Last page | 128 |
| Conference Title | Proceedings of the 1993 Annual Meeting on Utilities and Geothermal: An Emerging Partnership |
| Conference Location | Burlingame, CA, USA |
| Conference Date | 10 October 1993 through 13 October 1993 |