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Record Detail |
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Record Detail |
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Title: |
Locating an Active Fault Zone in COSO Geothermal Field by Analyzing Seismic Guided Waves from Microearthquake Data |
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Authors: |
M. Lou, P. E. Malin and J. A. Rial |
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Conference: |
Stanford Geothermal Workshop |
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Year: |
1995 |
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Session: |
Geoscience |
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Language: |
English |
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File Size: |
584KB |
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View File: |
Abstract:
Active fault systems usually provide high-permeability channels for hydrothermal outflow in geothermal fields. Locating such fault systems is of a vital importance to plan geothermal production and injection drilling, since an active fault zone often acts as a fracture-extensive low-velocity wave guide to seismic waves. We have located an active fault zone in the Cos0 geothermal field, California, by identifying and analyzing a fault-zone trapped Rayleigh-type guided wave from microearthquake data. The wavelet transform is employed to characterize guided-wave's velocity-frequency dispersion, and numerical methods are used to simulate the guided-wave propagation. The modeling calculation suggests that the fault zone is -200m wide, and has a P wave velocity of 4.80km/s and a S wave velocity of 3.OOkrn/s, which is sandwiched between two half spaces with relatively higher velocities ( P wave velocity 5.60kds, and S wave velocity 3.20kd/s).
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