| Abstract: | The permanent 16-station network of three-component digital seismometers at the Coso geothermal area, California, supplemented by 14 temporary instruments deployed in connection with the DOE Enhanced Geothermal Systems (EGS) Project, provides high-quality microearthquake (MEQ) recordings that are well suited to monitoring a producing geothermal area. We are currently using these data to investigate structure and active processes within the geothermal reservoir by applying three advanced methods: a) high-precision MEQ hypocenter location; b) time-dependent tomography; c) complete (moment tensor) MEQ source mechanism determination. Preliminary results to date resolve seismogenic structures in the producing field more clearly than is possible with conventional earthquake-location techniques. A shallow part of the producing field shows clear changes in the ratio of the seismic wave speeds, Vp/V s, between 1996 and 2002, which are probably related to physical changes in the reservoir caused by fluid extraction. |
| Genre: | Conference Paper |
| ProdID: | 70026310 |
| Citation Author: | Julian, B. R.; Foulger, G. R.; Richards-Dinger, K. |
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| Citation End Page: | 405 |
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| Citation Language: | English |
| Citation Larger Work Title: | Transactions - Geothermal Resources Council |
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| Citation Number Of Pages: | 3 |
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| Citation Search Results Text: | The Coso geothermal area: A laboratory for advanced MEQ studies for geothermal monitoring; 2004; Conference Paper; Transactions - Geothermal Resources Council; Julian, B. R.; Foulger, G. R.; Richards-Dinger, K. |
| Citation Start Page: | 403 |
| Citation Volume: | 28 |
| Citation Year: | 2004 |
| Type: | citation/reference |
| Text: | The Coso geothermal area: A laboratory for advanced MEQ studies for geothermal monitoring; 2004; Conference Paper; Transactions - Geothermal Resources Council; Julian, B. R.; Foulger, G. R.; Richards-Dinger, K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 2004 00:00 -0600 |
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