气候变化领域集成服务门户(CCPortal): Seismically Induced Unclogging in Fluid-Saturated Faults

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DOI	10.1029/2020JB020152
	Seismically Induced Unclogging in Fluid-Saturated Faults
	Barbosa N.D.; Solazzi S.G.; Lupi M.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Evidence shows that flow-driven unclogging of pore spaces is correlated with permeability variations in fluid-saturated porous rocks. Due to the well-established ability of seismic waves to induce transient fluid flow in porous media, permeability changes due to seismically induced unclogging have been proposed to explain hydrogeological phenomena commonly associated with distant earthquakes. In an effort to demonstrate the effects of seismically induced unclogging, laboratory experiments of forced oscillatory flow in centimeter-scale samples have been performed. However, the corresponding extrapolation of the observations to the field scale has yet to be addressed. In this work, we model the coupling between the strains imposed by propagating seismic body waves and the development of transient flow in porous media following Biot's theory of poroelasticity. To assess the potential of seismically induced unclogging, we use previously reported flow velocity thresholds for which measurable permeability variations were observed. We show that only diffusive waves can induce flow velocities in the order of those capable of initiating unclogging. In heterogeneous media, diffusive waves are created as energy conversion from passing seismic waves at the interfaces separating two porous phases of the medium. We investigate this mesoscale process for body waves propagating across a fault zone as a function of the energy density, frequency, and incidence angle of the waves. Seismically induced unclogging potential in fault zones increases with frequency and imposed strain, although this relation is strongly affected by the incidence angle of the seismic wave, the fault thickness, and the stiffness contrast between the fault and the embedding background. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	fault; permeability; poroelasticity; seismic wave propagation; seismically induced unclogging
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/187675
作者单位	Department of Earth Sciences, University of Geneva, Geneva, Switzerland; Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland
推荐引用方式 GB/T 7714	Barbosa N.D.,Solazzi S.G.,Lupi M.. Seismically Induced Unclogging in Fluid-Saturated Faults[J],2020,125(8).
APA	Barbosa N.D.,Solazzi S.G.,&Lupi M..(2020).Seismically Induced Unclogging in Fluid-Saturated Faults.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Barbosa N.D.,et al."Seismically Induced Unclogging in Fluid-Saturated Faults".Journal of Geophysical Research: Solid Earth 125.8(2020).