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

Temporal static stress drop variations due to injection activity at The Geysers geothermal field, California
Temporal static stress drop variations due to injection activity at The Geysers geothermal field, California
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 drop changes are inversely related to injection rate fluctuations. Therefore, it is highly expected that static stress drop of seismic events is influenced by pore pressure in underground fluid injection conditions and depends on the effective normal stress and strength of the medium.
0094-8276
7168-7176
Staszek, M.
5927159b-a584-40de-a8b8-0dbeae0c5f36
Orlecka-Sikora, B.
a7971263-a47e-4fcf-8486-402a923ca205
Leptokaropoulos, K.
6176f4d8-7af0-4575-bf2c-5aaba3d182ce
Kwiatek, G.
b9f561f3-7da5-48a1-956e-3d363edd9174
Martínez-Garzón, P.
81dabb88-e611-4887-b15b-ad03483f5b36
Staszek, M.
5927159b-a584-40de-a8b8-0dbeae0c5f36
Orlecka-Sikora, B.
a7971263-a47e-4fcf-8486-402a923ca205
Leptokaropoulos, K.
6176f4d8-7af0-4575-bf2c-5aaba3d182ce
Kwiatek, G.
b9f561f3-7da5-48a1-956e-3d363edd9174
Martínez-Garzón, P.
81dabb88-e611-4887-b15b-ad03483f5b36

Staszek, M., Orlecka-Sikora, B., Leptokaropoulos, K., Kwiatek, G. and Martínez-Garzón, P. (2017) Temporal static stress drop variations due to injection activity at The Geysers geothermal field, California. Geophysical Research Letters, 44 (14), 7168-7176. (doi:10.1002/2017GL073929).

Record type: Article

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 drop changes are inversely related to injection rate fluctuations. Therefore, it is highly expected that static stress drop of seismic events is influenced by pore pressure in underground fluid injection conditions and depends on the effective normal stress and strength of the medium.

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Published date: 28 July 2017

Identifiers

Local EPrints ID: 448122
URI: http://eprints.soton.ac.uk/id/eprint/448122
ISSN: 0094-8276
PURE UUID: 2e5dcb25-4eff-4dfa-8cf2-8e46871b9e65
ORCID for K. Leptokaropoulos: ORCID iD orcid.org/0000-0002-7524-0709

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Date deposited: 01 Apr 2021 15:59
Last modified: 17 Jul 2021 02:09

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Contributors

Author: M. Staszek
Author: B. Orlecka-Sikora
Author: G. Kwiatek
Author: P. Martínez-Garzón

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