Non-double-couple earthquake mechanisms at the Geysers geothermal area, California
Geophysical Research Letters
By: A. Ross, G.R. Foulger, and B.R. Julian
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Non-double-couple earthquake mechanisms at the Geysers geothermal area, California |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/96GL00590 |
| Volume | 23 |
| Issue | 8 |
| Year Published | 1996 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Volcano Hazards Program |
| Description | 4 p. |
| First page | 877 |
| Last page | 880 |
| Country | United States |
| State | California |
| Other Geospatial | Geysers Geothermal Area |
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