<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California"^^ . "One of the major environmental impacts of shale gas exploitation is triggered and induced seismicity. Due to the\r\nsimilarity of fluid injection process data from geothermal fields can be used as a proxy for shale gas exploitation\r\nassociated seismicity. Therefore, in this paper we utilize ‘The Geysers’ dataset compiled within SHale gas\r\nExploration and Exploitation induced Risks (SHEER) project. The dependence of earthquake static stress drops on\r\npore pressure in the medium was previously suggested by Goertz-Allmann et al. (2011), who observed an increase\r\nof the static stress drop with the distance from injection well during reservoir stimulation at Deep Heat Mining\r\nproject in Basel, Switzerland. Similar observation has been done by Kwiatek et al. (2014) in Berlín geothermal\r\nfield, El Salvador. In this study, we use a high-quality data from The Geysers geothermal field to determine\r\nwhether the static stress drops and the stress drop distributions change statistically significantly in time or not,\r\nand how such changes are correlated with the values of hypocenter depth, water injection rate, and distance from\r\ninjection well. For the analyses we use a group of 354 earthquakes, which occurred in the proximity of Prati-9\r\nand Prati-29 injection wells. Spectral parameters of these earthquakes were determined using mesh spectral ratio\r\ntechnique. Our results indicate that: (1) the static stress drop variation in time is statistically significant, (2) median\r\nstatic stress drop is inversely related to median injection rate. Therefore, it is highly expected that static stress drop\r\nis influenced by pore pressure in underground fluid injection conditions.\r\n\r\nReferences:\r\nGoertz-Allmann B., Goertz A., Wiemer S. (2011), Stress drop variations of induced earthquakes at the Basel\r\ngeothermal site. Geophysical Research Letters, 38, L09308, doi:10.1029/2011GL047498.\r\nKwiatek G., Bulut F., Bohnhoff M., Dresen G. (2014), High-resolution analysis of seismicity induced at Berlin\r\ngeothermal field, El Salvador. Geothermics, 52, 98-111, doi: 10.1016/j.geothermics.2013.09.008.\r\n\r\nAcknowledgements:\r\nThis work was supported under SHEER: \"Shale Gas Exploration and Exploitation Induced Risks\" project funded\r\nfrom Horizon 2020 – R&I Framework Programme, call H2020-LCE-2014-1 and by the Ministry of Science and\r\nHigher Education of Poland under project no. 500-10-27."^^ . "2017-04" . . . . . . . . . . . . . . . . . . . . . "Monika"^^ . "Staszek"^^ . "Monika Staszek"^^ . . "Stanislaw"^^ . "Lasocki"^^ . "Stanislaw Lasocki"^^ . . "Konstantinos Michail"^^ . "Leptokaropoulos"^^ . "Konstantinos Michail Leptokaropoulos"^^ . . "Beata"^^ . "Orlecka-Sikora"^^ . "Beata Orlecka-Sikora"^^ . . "Patricia"^^ . "Martinez-Garzon"^^ . "Patricia Martinez-Garzon"^^ . . "Grzegorz"^^ . "Kwiatek"^^ . "Grzegorz Kwiatek"^^ . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . "Helmholtz-Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . "Helmholtz-Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany"^^ . . . . . "EGU General Assembly 2017"^^ . . . . . "Vienna, Austria"^^ . . . . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California (Slideshow)"^^ . . . . "Staszek_et_al_2017_Temporal_changes_of_static_stress_drop_as_a_proxy_for_poroelastic_effects_at_The_Geysers_geothermal_field_California_Presentation.pdf"^^ . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California (Other)"^^ . . . . . . "small.jpg"^^ . . . "Temporal changes of static stress drop as a proxy for poroelastic effects at\r\nThe Geysers geothermal field, California (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #1969 \n\nTemporal changes of static stress drop as a proxy for poroelastic effects at \nThe Geysers geothermal field, California\n\n" . "text/html" . . . "Technology induced stress field redistribution" . . . "Evolution of stress field changes" . . . "Geysers" . . . "Geothermal energy production" . .