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Title: |
Seismic Monitoring of EGS Tests at the Coso Geothermal Area, California, Using Accurate MEQ Locations and Full Moment Tensors |
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Authors: |
Gillian R. Foulger, Bruce R. Julian, Francis C. Monastero |
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Key Words: |
earthquakes, EGS, Coso |
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Geo Location: |
Coso, California |
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Conference: |
Stanford Geothermal Workshop |
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Year: |
2008 |
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Session: |
HDR/EGS |
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Language: |
English |
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File Size: |
961KB |
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View File: |
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We studied high-resolution relative locations and full moment tensors of microearthquakes (MEQs) occurring before, during and following Enhanced Geothermal Systems (EGS) experiments in two wells at the Coso geothermal area, California. The objective was to map new fractures, determine the mode and sense of failure, and characterize the stress cycle associated with injection. New software developed for this work combines waveform cross-correlation measurement of arrival times with relative relocation methods, and assesses confidence regions for moment tensors derived using linear-programming methods. For moment tensor determination we also developed a convenient Graphical User Interface (GUI), to streamline the work.
We used data from the U.S. Navy
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