Stress drop variations of induced earthquakes at the Basel geothermal site

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Seismology: Earthquake Source Observations (1240), Seismology: Earthquake Dynamics (1242), Tectonophysics: Hydrothermal Systems (0450, 1034, 3017, 3616, 4832, 8424), Physical Properties Of Rocks: Transport Properties

Scientific paper

We determine stress drops from P-wave spectra of about 1000 earthquakes induced by hydraulic stimulation in crystalline rock for a deep heat mining project in Basel, Switzerland. We observe an increase in stress drop by about a factor of five with radial distance from 10 m to 300 m, which suggests that stress drop correlates with pore pressure perturbations due to the injection. We test this hypothesis by calculating the injection-related pore pressure perturbation based on a simple linear pore pressure diffusion model and find a good correlation of the expected pore pressure perturbation with the estimated stress drops.

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