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

Staszek, Monika; Orlecka‐Sikora, Beata; Leptokaropoulos, Konstantinos; Kwiatek, Grzegorz; Martínez‐Garzón, Patricia

doi:10.1002/2017gl073929

Cited by 20 publications

(17 citation statements)

References 55 publications

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“…During this process, the seismicity, diversity of the focal mechanisms , stress drops, and b-values (Yoshida et al, 2017) were all affected by the evolution of pore pressure due to the migrating fluids. These observations are very similar to those observed in fluid-injection-experiments (e.g., Bachmann et al, 2011Bachmann et al, , 2012Kwiatek et al, 2014;Martínez-Garzón et al, 2014;Staszek et al, 2017), suggesting that the generation mechanism of the present earthquake swarm is essentially similar to fluid-injection-induced seismicity. This similarity supports the hypothesis that the present swarm was triggered by the migration of fluids.…”

Section: Discussionsupporting

confidence: 88%

“…Yoshida et al () suggested that the magnitude of the stress drop reflects the frictional strength, on the basis of the observed correlation between the two (Figure 13 in Yoshida et al, ). In fact, previous studies reported negative correlations between earthquake stress drops and pore pressure (i.e., positive correlations between stress drops and frictional strengths) based on observations of fluid‐injection‐induced‐seismicity (Goertz‐Allmann et al, ; Kwiatek et al, ; Staszek et al, ). Negative correlations between b‐values and differential stress were also suggested on the basis of rock experiments and theoretical considerations (Scholz, ).…”

Section: Discussionmentioning

confidence: 99%

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Hypocenter Migration and Seismicity Pattern Change in the Yamagata‐Fukushima Border, NE Japan, Caused by Fluid Movement and Pore Pressure Variation

Yoshida

Hasegawa

2018

JGR Solid Earth

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The spatiotemporal distributions of hypocenters and temporal change in seismicity patterns were investigated in details for events in the Yamagata‐Fukushima border earthquake swarm, which was a remotely triggered earthquake sequence by the 2011 Tohoku‐Oki earthquake. We relocated the hypocenters by applying the double‐difference location method to differential arrival time data obtained by waveform cross correlations together with the Japan Meteorological Agency catalogue data. The hypocenter distribution obtained clearly shows that the hypocenters are concentrated on several discrete planes and migrate along those planes from deeper to shallower levels instead of diffusing isotropically. Most of the events have nodal planes of focal mechanisms parallel to those discrete planes, suggesting that ruptures of individual events occurred along those macroscopic planes. The timing of earthquake occurrences is almost random during the initial ~50 days, but it gradually becomes temporally clustered in later periods, with the number of events decaying aftershock‐like after relatively large events. These observations suggest that the present swarm is caused by a reduction in frictional strength due to the increased pore pressure of fluids rising from greater depths in response to the decrease in arc‐normal compressional stress associated with the Tohoku‐Oki earthquake. The fluids permeated into several existing planes, reduced frictional strengths, caused the present earthquake swarm, and migrated upward along the planes with the hypocenters. Our previous observations that stress drops are systematically low and b‐values are high during the initial ~50 days can be readily explained if the pore pressure is especially high during that period.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Hypocenter Migration and Seismicity Pattern Change in the Yamagata‐Fukushima Border, NE Japan, Caused by Fluid Movement and Pore Pressure Variation

Yoshida

Hasegawa

2018

JGR Solid Earth

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“…Scholz 2015). As a result, the crustal strength is decreased, therefore failure occurs before significant stress buildup is accumulated (Staszek et al 2017). Moreover, this leads to a proportional increase of the b-value.…”

Section: Discussionmentioning

confidence: 99%

Evolution of seismicity in relation to fluid injection in the North-Western part of The Geysers geothermal field

Leptokaropoulos¹,

Staszek²,

Lasocki³

et al. 2017

Geophysical Journal International

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S U M M A R YThe Geysers geothermal field located in California, USA, is the largest geothermal site in the world, operating since the 1960s. We here investigate and quantify the correlation between temporal seismicity evolution and variation of the injection data by examination of timeseries through specified statistical tools (binomial test to investigate significant rate changes, cross correlation between seismic and injection data, b-value variation analysis). To do so, we utilize seismicity and operational data associated with two injection wells (Prati-9 and Prati-29) which cover a time period of approximately 7 yr (from November 2007 to August 2014). The seismicity is found to be significantly positively correlated with the injection rate. The maximum correlation occurs with a seismic response delay of ∼2 weeks, following injection operations. Those results are very stable even after considering hypocentral uncertainties, by applying a vertical shift of the events foci up to 300 m. Our analysis indicates also time variations of b-value, which exhibits significant positive correlation with injection rates.

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“…(Lasocki et al 2017;Leptokaropoulos et al 2017a). IS-EPOS has been already used to facilitate scientific research in recently published papers connected with anthropogenic as well as natural seismicity by utilizing data, applications and/or the interface and facilities of the platform (Wiszniowski et al 2015;Kozłowska et al 2016;Lizurek 2017;Rudziński and Dineva 2017;Gkarlaouni et al 2017;Lizurek et al 2017;Olszewska et al 2017;Staszek et al 2017;Leptokaropoulos et al 2017bLeptokaropoulos et al , 2018aLeptokaropoulos and Staszek 2018;Orlecka-Sikora et al 2018). Fig.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

IS-EPOS: a platform for anthropogenic seismicity research

et al. 2018

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Research in the field of anthropogenic seismicity (AS) requires not only seismicity data but also data regarding the progress of the technological/production activities which is the origin of the induced or triggered seismic events. Such data are typically restricted and proprietary, and therefore, usually not available for independent researchers who wish to develop, perform and verify scientific research. The induced seismicity-European plate observing system (IS-EPOS) web portal offers to its user's access to data, applications and documents in order to facilitate AS research. IS-EPOS web portal has been designed to serve as one of the main pillars of the Thematic Core Service-Anthropogenic Hazards belonging to pan-European multidisciplinary research infrastructure created within the EPOS program. IS-EPOS platform is open for research community and general public according to its rules of access. The platform is operating since January 2016 and is now integrated in the EPOS Integrated Core Services. IS-EPOS e-platform promotes new opportunities to study and comprehend the dynamic and complex solid earth system by integrating the use of multidisciplinary data, data products, analysis models and online applications. The integration of existing and new national and transnational Research Infrastructures increases the access and use of multidisciplinary data recorded by the solid earth observing systems, acquired in laboratory experiments and/ or produced by computational simulations. In this paper, we describe the structure and the main innovative characteristics implemented in IS-EPOS. The platform is open to accommodate data integrated within other research projects, and it is continuously being updated with improvements in existing features and implementations of new ones. An appendix at the end of the article provides a summary of acronyms and abbreviations in order to make the reader familiar with the terms used throughout the manuscript.

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

Cited by 20 publications

References 55 publications

Hypocenter Migration and Seismicity Pattern Change in the Yamagata‐Fukushima Border, NE Japan, Caused by Fluid Movement and Pore Pressure Variation

Hypocenter Migration and Seismicity Pattern Change in the Yamagata‐Fukushima Border, NE Japan, Caused by Fluid Movement and Pore Pressure Variation

Evolution of seismicity in relation to fluid injection in the North-Western part of The Geysers geothermal field

IS-EPOS: a platform for anthropogenic seismicity research

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