DOI: 10.1002/2015GL063671
论文题名: Seismic responses to fluid pressure perturbations in a slipping fault
作者: Derode B. ; Guglielmi Y. ; De Barros L. ; Cappa F.
刊名: Geophysical Research Letters
ISSN: 0094-8702
EISSN: 1944-8433
出版年: 2015
卷: 42, 期: 9 起始页码: 3197
结束页码: 3203
语种: 英语
英文关键词: fluid pressure
; hydromechanical coupling
; long period events
; seismology
; tremor-like signal
Scopus关键词: Frequency bands
; Seebeck effect
; Constant amplitude
; Effective stress
; Fluid pressures
; Hydromechanical coupling
; Long-period events
; Micro-earthquakes
; Narrow frequency band
; Residual pressures
; Seismology
; earthquake event
; fault displacement
; fluid injection
; fluid pressure
; friction
; seismic response
英文摘要: 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 17s 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 (∼3.5MPa), 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 ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930476629&doi=10.1002%2f2015GL063671&partnerID=40&md5=03adddbe4781ae1584b6042336a02271
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8318
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geophysics, University of Chile, Santiago, Chile
Recommended Citation:
Derode B.,Guglielmi Y.,De Barros L.,et al. Seismic responses to fluid pressure perturbations in a slipping fault[J]. Geophysical Research Letters,2015-01-01,42(9).