| Abstract: | Inverting P- and S-wave polarities and P:SH amplitude ratios using linear programming methods suggests that about 20% of earthquakes at The Geysers geothermal area have significantly non-double-couple focal mechanisms, with explosive volumetric components as large as 33% of the seismic moment. This conclusion contrasts with those of earlier studies, which interpreted data in terms of double couples. The non-double-couple mechanisms are consistent with combined shear and tensile faulting, possibly caused by industrial water injection. Implosive mechanisms, which might be expected because of rapid steam withdrawal, have not been found. Significant compensated-linear-vector-dipole (CLVD) components in some mechanisms may indicate rapid fluid flow accompanying crack opening. Copyright 1996 by the American Geophysical Union. |
| Genre: | Article |
| ProdID: | 70018157 |
| Citation Author: | Ross, A.; Foulger, G. R.; Julian, B. R. |
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| Citation End Page: | 880 |
| Citation Issue: | 8 |
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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: | Non-double-couple earthquake mechanisms at the Geysers geothermal area, California; 1996; Article; Journal; Geophysical Research Letters; Ross, A.; Foulger, G. R.; Julian, B. R. |
| Citation Start Page: | 877 |
| Citation Volume: | 23 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Non-double-couple earthquake mechanisms at the Geysers geothermal area, California; 1996; Article; Journal; Geophysical Research Letters; Ross, A.; Foulger, G. R.; Julian, B. 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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