publication . Article . Other literature type . 2017

Temporal static stress drop variations due to injection activity at The Geysers geothermal field, California

Staszek, M.; Orlecka-Sikora, B.; Leptokaropoulos, K.; Kwiatek, G.; Martínez-Garzón, P.;
Open Access English
  • Published: 28 Jul 2017 Journal: Geophysical Research Letters, volume 44, issue 14, pages 7,168-7,176 (issn: 00948276, Copyright policy)
  • Country: Germany
Abstract
We use a high-quality data set from the NW part of The Geysers geothermal field to determine statistical significance of temporal static stress drop variations and their relation to injection rate changes. We use a group of 322 seismic events which occurred in the proximity of Prati-9 and Prati-29 injection wells to examine the influence of parameters such as moment magnitude, focal mechanism, hypocentral depth, and normalized hypocentral distances from open-hole sections of injection wells on static stress drop changes. Our results indicate that (1) static stress drop variations in time are statistically significant, (2) statistically significant static stress ...
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Subjects
free text keywords: Moment magnitude scale, Geothermal gradient, Geology, Focal mechanism, Injection well, Pore water pressure, Static stress, Geotechnical engineering, Stress (mechanics), Soil science, Injection rate
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EC| EPOS IP
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EPOS IP
EPOS Implementation Phase
  • Funder: European Commission (EC)
  • Project Code: 676564
  • Funding stream: H2020 | RIA
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EC| SHEER
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SHEER
SHale gas Exploration and Exploitation induced Risks
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  • Project Code: 640896
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