气候变化领域集成服务门户(CCPortal): Stress Perturbation From Aseismic Slip Drives the Seismic Front During Fluid Injection in a Permeable Fault

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DOI	10.1029/2019JB019179
	Stress Perturbation From Aseismic Slip Drives the Seismic Front During Fluid Injection in a Permeable Fault
	Wynants-Morel N.; Cappa F.; De Barros L.; Ampuero J.-P.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Fluid pressure changes affect fault stability and can promote the initiation of earthquakes and aseismic slip. However, the relationship between seismic and aseismic fault slip during fluid injection remains poorly understood. Here, we investigate, through 3-D hydromechanical modeling, the spatiotemporal evolution of seismicity and aseismic slip on a permeable, slip-weakening fault subjected to a local injection of fluid, under different prestress conditions. The model results in an expanding aseismic slip region, which concentrates shear stress at its edge and triggers seismicity. The aseismic slip dominates the slip budget, whatever the initial fault stress. We find that the seismicity is collocated with the aseismic rupture front rather than with the fluid pressure diffusion front. On faults initially far from failure, the aseismic rupture front is located behind or at the pressure front. On faults initially closer to failure, the model predicts that both the rupture front and the seismicity outpace the pressurized zone, resulting in a sharp increase of the migration velocity and released moment of the seismicity. Insights gained from this modeling study exhibit various features that are observed in sequences of induced earthquakes in both field experiments and natural reservoir systems and can help guide the interpretation of past and future observations of induced seismicity. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	aseismic slip; fault rupture; fluid injection; friction weakening; induced seismicity; permeability
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187783
作者单位	Université Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, IRD, Géoazur, Sophia Antipolis, France; Institut Universitaire de France, Paris, France
推荐引用方式 GB/T 7714	Wynants-Morel N.,Cappa F.,De Barros L.,et al. Stress Perturbation From Aseismic Slip Drives the Seismic Front During Fluid Injection in a Permeable Fault[J],2020,125(7).
APA	Wynants-Morel N.,Cappa F.,De Barros L.,&Ampuero J.-P..(2020).Stress Perturbation From Aseismic Slip Drives the Seismic Front During Fluid Injection in a Permeable Fault.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Wynants-Morel N.,et al."Stress Perturbation From Aseismic Slip Drives the Seismic Front During Fluid Injection in a Permeable Fault".Journal of Geophysical Research: Solid Earth 125.7(2020).