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Seismic responses to fluid pressure perturbations in a slipping fault

Derode, Benoit ; Guglielmi, Yves ; De Barros, Louis ; Cappa, Frédéric

Geophysical research letters, 2015-05, Vol.42 (9), p.3197-3203 [Periódico revisado por pares]

Washington: Blackwell Publishing Ltd

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Título:
Seismic responses to fluid pressure perturbations in a slipping fault
Autor: Derode, Benoit ; Guglielmi, Yves ; De Barros, Louis ; Cappa, Frédéric
Assuntos: Amplitude ; Dilation ; Duration ; Earth Sciences ; Earthquakes ; Effective stress ; Faults ; Fluid injection ; Fluid pressure ; Frequency ; Friction ; Geological faults ; hydromechanical coupling ; Injection ; Instability ; Leakage ; long period events ; Microearthquakes ; Permeability ; Perturbation ; Perturbations ; Plate tectonics ; Pressure ; Rupture ; Sciences of the Universe ; Seismic activity ; Seismic response ; Seismic stability ; Seismicity ; Seismology ; Sequencing ; Slip ; Stresses ; Synchronous ; Tremor ; tremor-like signal
É parte de: Geophysical research letters, 2015-05, Vol.42 (9), p.3197-3203
Notas: istex:3968AB4B9C9DC1DFA63D65CB705600A99FE96F84
PACA county through the "PETROPRO" project
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Descrição: Seismicity induced by fluid injection in a natural fault is investigated in situ in the near field of the source. We present synchronous seismic and hydromechanical measurements directly recorded in the decametric injection zone. The three main types of seismic events were recorded during injection and shut‐in: high‐amplitude and short duration seismic events (SE) (i.e., microearthquakes), low to constant amplitude and 5 to 17 s long tremor‐like signals (TLS), and long period events (LP) with a narrow‐frequency band content. Seismicity first initiates with a sequence of SE and TLS, when pressure is high (~3.5 MPa), slip is activated on the fault, which experiences a twentyfold increase of permeability. Then LP events appear to be associated to fluid leakage in the fault caused by dilation during slip. During shut‐in, residual pressures as low as 0.6 MPa still trigger SE events. We show that the initial TLS sequence triggers when a progressive transition occurs from rupture controlled by effective stress variations close to the injection source to a large friction weakening‐dominated slip on the fault. We conclude that the combination of these different seismic signal types may be a proxy to monitor fault instability associated to fluid pressure perturbations. Key Points Synchronous seismic and hydromechanical measurements are made in situ in a fault Microearthquakes, long period and tremor‐like signal events were recorded These three types of event are associated to various hydromechanical processes
Editor: Washington: Blackwell Publishing Ltd
Idioma: Inglês

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Seismic responses to fluid pressure perturbations in a slipping fault

Derode, Benoit ; Guglielmi, Yves ; De Barros, Louis ; Cappa, Frédéric

Washington: Blackwell Publishing Ltd

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