气候变化领域集成服务门户(CCPortal): Conditions for Triggering Seismic Ruptures and/or Slow Slip Events in the Framework of a Poro-Plastic Fault Zone Model

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DOI	10.1029/2019JB019273
	Conditions for Triggering Seismic Ruptures and/or Slow Slip Events in the Framework of a Poro-Plastic Fault Zone Model
	Maury V.; Piau J.-M.; Fitzenz D.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Active fault zones are not simple frictional interfaces. They are complex, evolving 3-D structures that contain pore fluids in drained or undrained conditions. They show stable or unstable slip, dilatant or contractant elastic or plastic local deformations in response to far-field extensive or compressive displacements. Pore fluid pressure variations induce effective stress and fluid compressibility changes, possibly up to degassing. For these reasons, we choose to use an analytical model in which the fault zone is schematized by a mesoscale poroplastic interface surrounded by two symmetrical elastic pads to investigate the conditions that can lead to slow slip vs. seismic slip. The chosen end-cap plastic failure criterion and associated flow rule account for hardening/softening regimes. The model computes stress paths, normal/tangential displacement, and fluid pressure variations of the fault zone with time. Depending on the initial stress, pore pressure conditions, far-field loading rate, and fluid compressibility, scenarios emerge that link together stable plastic deformation regimes (months to years, small displacements) and unstable regimes (seconds, metric displacements). While some scenarios show the occurrence of instability preceded or not by slow slip events, others show slow events without instability (mainshock). Also investigated are the effect of a switch from undrained to drained condition and the role of the change in fluid compressibility due to dilatancy. Finally, we discuss the geodetic and geophysical data necessary to calibrate the parameters of the empirical relationships. Slow slip event areas are therefore not necessarily “safe” and might produce earthquakes if conditions change. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	compressible-fluid; earthquakes; fault-modeling; plastic-interface; poromechanics; SlowSlipEvents
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/187701
作者单位	IFP School, Rueil-Malmaison, France; MAST-LAMES, Univ Gustave Eiffel, IFSTTAR, France; RMS, Newark, CA, United States
推荐引用方式 GB/T 7714	Maury V.,Piau J.-M.,Fitzenz D.. Conditions for Triggering Seismic Ruptures and/or Slow Slip Events in the Framework of a Poro-Plastic Fault Zone Model[J],2020,125(8).
APA	Maury V.,Piau J.-M.,&Fitzenz D..(2020).Conditions for Triggering Seismic Ruptures and/or Slow Slip Events in the Framework of a Poro-Plastic Fault Zone Model.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Maury V.,et al."Conditions for Triggering Seismic Ruptures and/or Slow Slip Events in the Framework of a Poro-Plastic Fault Zone Model".Journal of Geophysical Research: Solid Earth 125.8(2020).