To stimulate the reservoir for a “hot dry rock” geothermal project initiated by a private/public consortium in the city of Basel, Switzerland, approximately 11,500 m3 of water were injected at high pressures between 2 December and 8 December 2006 into a 5-km-deep well below Kleinhüningen (Häring et al. 2008). A six-sensor borehole array, installed by the operators of the project at depths between 317 and 2,740 meters around the well to monitor the induced seismicity recorded more than 10,500 seismic events during the injection phase. Hypocentral locations could be calculated for more than 3,000 of these events....

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