Stress drop variations of induced earthquakes at the Basel geothermal site

Details Stress drop variations of induced earthquakes at the Basel geothermal site Stress drop variations of induced earthquakes at the Basel geothermal site

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809308g&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 9, CiteID L09308

Other

3

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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