%0 Journal Article %@ 1383-4649 %A Häge, Martin %A Blascheck, Patrick %A Joswig, Manfred %A Institute of Geophysics, University of Stuttgart, Stuttgart, Germany, %D 2013 %F epos:1265 %I Springer Verlag %J Journal of Seismology %K Geothermal Enhanced geothermal systems Deep Heat Mining Basel Induced seismicity Mini arrays %N 1 %P 51-61 %T EGS hydraulic stimulation monitoring by surface arrays - location accuracy and completeness magnitude: the Basel Deep Heat Mining Project case study %U https://episodesplatform.eu/eprints/1265/ %V 17 %X The potential and limits of monitoring induced seismicity by surface-based mini arrays was evaluated for the hydraulic stimulation of the Basel Deep Heat Mining Project. This project aimed at the exploitation of geothermal heat from a depth of about 4,630 m. As reference for our results, a network of borehole stations by Geothermal Explorers Ltd. provided ground truth information. We utilized array processing, sonogram event detection and outlier-resistant, graphical jackknife location procedures to compensate for the decrease in signal-to-noise ratio at the surface. We could correctly resolve the NNW–SSE striking fault plane by relative master event locations. Statistical analysis of our catalog data resulted in M L 0.36 as completeness magnitude, but with significant day-to-night dependency. To compare to the performance of borehole data with M W 0.9 as completeness magnitude, we applied two methods for converting M L to M W which raised our M C to M W in the range of 0.99–1.13. Further, the b value for the duration of our measurement was calculated to 1.14 (related to M L), respectively 1.66 (related to M W), but changes over time could not be resolved from the error bars.