Non-linear effects of pore pressure increase on seismic event generation in a multi-degree-of-freedom rate-and-state model of tectonic fault sliding

Turuntaev, S. B.; Riga, Vasily

doi:10.5194/npg-24-215-2017

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…It is therefore better suited to explain features of the earthquake cycle. Various models based on the rate‐ and state‐dependent friction have been developed, like a multidegree of freedom spring‐slider system by Turuntaev and Riga (), a homogeneous rate‐weakening fault by Kroll et al () and McClure and Horne (), or based on the seismicity rate model proposed by Dietrich () as Segall and Lu (), Barbour et al () and Chang et al (). But these models either have not fully explored the role of injection history or considered simplified stress interactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Injection Scenario on the Rate and Magnitude Content of Injection‐Induced Seismicity: Case of a Heterogeneous Fault

et al. 2019

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Injection of fluids into underground formations reactivates preexisting faults and modifies the seismic hazard, as demonstrated by the 2011 Mw 5.7 and the 2016 Mw 5.8 earthquakes in Oklahoma. Currently, the effect of injection remains poorly understood. We model the seismicity triggered by a fluid flowing inside a Dietrich‐Ruina heterogeneous 2‐D fault, which can generate irregular sequences of events with magnitudes obeying Gutenberg Richter distribution. We consider a punctual injection scenario where injection pressure increases at a constant rate until a maximum pressure is reached and kept constant. We show that such a fluid injection leads to a sharp increase in the seismicity rate, which correlates with the time series of the pore pressure rate, for a wide range of injection pressure. Increasing the final pressure leads to an increase in the amplitude and the duration of the seismicity rate perturbation but also to a decrease in the frequency of large‐magnitude events. The maximum seismicity rate during the sequence also increases with the injection pressure rate, as long as a pressure‐rate threshold is not exceeded. Beyond it, the effect of increasing the injection rate is to make large‐magnitude earthquakes more frequent. While the total number of induced earthquakes is essentially controlled by the maximum pressure, the total seismic moment liberated increases with both the maximum pressure and the pressure rate. The comparison of our model to Dietrich's (1994, https://doi.org/10.1029/93JB02581) model shows the important trade‐off existing between seismicity rate perturbations and magnitude content variations of fluid induced seismicity.

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Section: Introductionmentioning

confidence: 99%

Effect of the Injection Scenario on the Rate and Magnitude Content of Injection‐Induced Seismicity: Case of a Heterogeneous Fault

et al. 2019

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“…As others (e.g., [79,80]) have noted, if production at rate Q starts at time t = 0, the variation in P, ΔP, after t = 0 takes the form…”

Section: Pressure Drawdown Accompanying Productionmentioning

confidence: 93%

Seismicity at Newdigate, Surrey, during 2018-2019: A candidate mechanism indicating causation by nearby oil production

Westaway

2020

Preprint

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During 2018-2019, oil was intermittently produced from the Late Jurassic Upper Portland Sandstone in the Weald Basin, southeast England, via the Horse Hill-1 and Brockham-X2Y wells. Concurrently, a sequence of earthquakes of magnitude ≤3.25 occurred near Newdigate, $3 km and $8 km from these wells. The pattern, with earthquakes concentrated during production from this Portland reservoir, suggests a cause-and-effect connection. It is proposed that this seismicity occurred on a patch of fault transecting permeable Dinantian limestone, beneath the Jurassic succession of the Weald Basin, hydraulically connected to this reservoir via this permeable fault and the permeable calcite 'beef' fabric within the Portland sandstone; oil production depressurizes this reservoir and draws groundwater from the limestone, compacting it and 'unclamping' the fault, reaching the Mohr-Coulomb failure criterion and causing seismicity. In principle this model is fully testable, but required data, notably the history of pressure variations in the wells, are not currently in the public domain. Quantitative estimates are, nonetheless, made of the magnitudes of the variations, arising from production from each well, in the state of stress on the seismogenic Newdigate fault. The general principles of this model, including the incorporation of poroelastic effects and effects of fault asperities into Mohr-Coulomb failure calculations, may inform understanding of anthropogenic seismicity in other settings.

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Seismic-Acoustics of a Block Sliding Along a Fault

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Ruzhich

et al. 2019

Pure Appl. Geophys.

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Non-linear effects of pore pressure increase on seismic event generation in a multi-degree-of-freedom rate-and-state model of tectonic fault sliding

Cited by 7 publications

References 12 publications

Effect of the Injection Scenario on the Rate and Magnitude Content of Injection‐Induced Seismicity: Case of a Heterogeneous Fault

Effect of the Injection Scenario on the Rate and Magnitude Content of Injection‐Induced Seismicity: Case of a Heterogeneous Fault

Seismicity at Newdigate, Surrey, during 2018-2019: A candidate mechanism indicating causation by nearby oil production

Seismic-Acoustics of a Block Sliding Along a Fault

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