| Abstract: | Three-dimensional seismic travel-time tomography of The Geysers geothermal area, in the coast ranges of northern California, shows a strong (-9%) anomaly in VP/VS, the ratio of the compressional and shear wave speeds, that is not evident in Vp alone and corresponds closely to the most intensively exploited part of the geothermal reservoir. This anomaly probably indicates low pore pressure and relatively dry conditions, caused partly by boiling of pore water as steam is extracted. Steam pressure decreases over the last decade have probably caused seismologically measurable changes in wave speeds. Tomographic measurement of Vp/Vs is a promising technique both for identifying geothermal resources and for monitoring them during exploitation. |
| Genre: | Article |
| ProdID: | 70018180 |
| Citation Author: | Julian, B. R.; Ross, A.; Foulger, G. R.; Evans, J. R. |
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| Citation End Page: | 688 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Three-dimensional seismic image of a geothermal reservoir: The Geysers, California; 1996; Article; Journal; Geophysical Research Letters; Julian, B. R.; Ross, A.; Foulger, G. R.; Evans, J. R. |
| Citation Start Page: | 685 |
| Citation Volume: | 23 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Three-dimensional seismic image of a geothermal reservoir: The Geysers, California; 1996; Article; Journal; Geophysical Research Letters; Julian, B. R.; Ross, A.; Foulger, G. R.; Evans, J. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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