Time-dependent Seismic Tomography of the Coso Geothermal Area, 1996-2004
- Key words
- microearthquake, time variation, seismic-wave speed
- Location
- Coso, California
- Conference
- Stanford Geothermal Workshop
- Year
- 2006
- Session
- Coso - Special Session
- Language
- English
- Paper number
- Julian
Full text
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Abstract
Local-earthquake tomographic images were calculated for each of the years 1996 - 2004 using arrival times from the U.S. Navy's permanent seismometer network at the Coso geothermal area, California. The results show irregular strengthening with time of the wave-speed ratio VP/VS at shallow depths. These changes result predominately from progressive relative increase in VS with respect to VP, and could result from processes associated with geothermal operations such as decrease in fluid pressure and the drying of argillaceous minerals such as illite.
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