2003 SEG Annual Meeting,
2003. Society of Exploration Geophysicists
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Laboratory experiments have shown that the static shear stress acting on a fracture displays a distinctive seismic signature. For plane P waves normally incident on a fracture, the application of a static shear stress results in converted, plane S waves. For incident S waves converted P waves are produced. The amplitude and polarity of these converted waves are directly related to the magnitude and direction of the static shear stress acting on the fracture. We use a numerical model to investigate the relationship between converted waves, fracture geometry and in-situ shear stress. This model can capture the response of fractured rocks to both dynamic and quasi-static stresses, allowing ‘time-lapse’ seismic simulations to be carried out across the fracture during changing stress conditions.
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