<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Induced Seismicity during the Stimulation of a Geothermal HFR Reservoir in the Cooper Basin, Australia"^^ . "A long-term fluid-injection experiment was performed in the Cooper\r\nBasin (Australia) in 2003 to stimulate a geothermal reservoir. More than 20,000 m^3\r\nof water were injected into the granitic crust at 4250 m depth. During reservoir\r\nstimulation about 27,000 induced seismic events were detected by a local, eight-station seismic monitoring system deployed in nearby boreholes. Hypocenter loca-\r\ntions for 11,068 events were determined by using an averaged velocity model that\r\nwas calibrated by associating early events with the injection point. The spatial hypocenter distribution forms a nearly subhorizontal structure with a lateral extension\r\nof 2 km x 1.5 km and an apparent thickness of approximately 150–200 m, which\r\nis in the order of the hypocenter location confidence limits. The hypocenter distribution exhibits a high degree of spatiotemporal ordering with the seismic activity\r\nsystematically migrating away from the injection well with increasing time. Previously activated regions become seismically quiet indicating relaxation processes.\r\nHigh-resolution relative hypocenter locations determined for clusters of “similar”\r\nevents locally reduce the apparent thickness of the structure to the level of a few tens\r\nof meters indicating that the reservoir is dominated by a single fracture zone only.\r\nConsistent with these findings, a subsequently drilled well intersects a dominating,\r\nhigh-permeable fracture within 15 m of the predicted intersection depth. Based on\r\ndrilling and logging information, the fracture zone is interpreted as a preexisting\r\n(possibly tectonically formed) feature that (partly) sheared during stimulation. Triggering of the induced seismicity is found to be predominantly controlled by the\r\nincrease of fluid pressure implicating a (local) reduction of the effective normal stress\r\nresolved on the fracture plane. Additionally, perturbations of the stress field caused\r\nby the largest-magnitude events may trigger seismicity (“aftershocks”) on a local,\r\nshort-ranging scale."^^ . "2006-12" . . "96" . "6" . . "Seismological Society of America"^^ . . . "Bulletin of the Seismological Society of America"^^ . . . "00371106" . . . . . . . . . . . . . . . . . . . "Robert"^^ . "Vörös"^^ . "Robert Vörös"^^ . . "Stefan"^^ . "Baisch"^^ . "Stefan Baisch"^^ . . "R."^^ . "Weidler"^^ . "R. Weidler"^^ . . "D."^^ . "Wyborn"^^ . "D. Wyborn"^^ . . "L."^^ . "de Graaf"^^ . "L. de Graaf"^^ . . "Q-con GmbH Marktstr. 39 76887 Bad Bergzabern, Germany"^^ . . . "Geodynamics Limited 11 Lang Parade, Milton Queensland 4064, Australia"^^ . . . . . . "HTML Summary of #1375 \n\nInduced Seismicity during the Stimulation of a Geothermal HFR Reservoir in the Cooper Basin, Australia\n\n" . "text/html" . . . "Collective properties of seismicity" . . . "Technology-seismicity interaction" . . . "Copper Basin" . . . "Geothermal energy production" . .