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

Authors: Konstantinos Michail Leptokaropoulos; Monika Staszek; Stanislaw Lasocki; Patricia Martínez-Garzón; Grzegorz Kwiatek;

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

Abstract

The 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 time-series 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.

Country
Germany
Subjects by Vocabulary

Microsoft Academic Graph classification: Fluid injection Time series Induced seismicity Response delay Geothermal gradient Injection well Geology Seismology Vertical shift Field (geography)

Keywords

Geophysics, Geochemistry and Petrology

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    20
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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  • 25
    views
    75
    downloads
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visibility
download
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
OpenAIRE UsageCountsDownloads provided by UsageCounts
20
Top 10%
Average
Top 10%
25
75
Funded by
EC| SHEER
Project
SHEER
SHale gas Exploration and Exploitation induced Risks
  • Funder: European Commission (EC)
  • Project Code: 640896
  • Funding stream: H2020 | RIA
Validated by funder
,
EC| EPOS IP
Project
EPOS IP
EPOS Implementation Phase
  • Funder: European Commission (EC)
  • Project Code: 676564
  • Funding stream: H2020 | RIA
Validated by funder | sysimport:crosswalk
Related to Research communities
European Plate Observing System
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