文献类型：期刊文献

英文题名：Controls of Gouge Heterogeneity on Cyclic Reactivation of Fault-Valve Systems

作者：Zhong, Zhen[1,2];Song, Zheye[1];Li, Bo[3];Elsworth, Derek[4,5,6];Hu, Yunjin[1,2];Zhang, Fengshou[3];Chen, Zhiyuan[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China;[2]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Peoples R China;[3]Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai, Peoples R China;[4]Penn State Univ Pk, EMS Energy Inst, Dept Energy & Mineral Engn, University Pk, PA USA;[5]Penn State Univ Pk, G3 Ctr, University Pk, PA USA;[6]Penn State Univ Pk, Dept Geosci, University Pk, PA USA

年份：2025

卷号：52

期号：14

外文期刊名：GEOPHYSICAL RESEARCH LETTERS

收录：SCI-EXPANDED(收录号：WOS:001536258400001)、、EI(收录号：20253118887093)、Scopus(收录号：2-s2.0-105011877947)、WOS

基金：We are grateful to Frederic Cappa and Kyungjae Im for their thoughtful and constructive comments, which have significantly improved the quality and rigor of this manuscript. This work was supported by National Natural Science Foundation of China (Grant Numbers 42477216, 42377162), Natural Science Foundation of Zhejiang Province (Grant Number LGJ20E090001). All the supports are gratefully acknowledged.

语种：英文

外文关键词：fault heterogeneity; fault-valve behavior; pore pressure; clay content; maximum seismic magnitude

外文摘要：Fault zones are inherently heterogeneous and exert significant impacts on fluid injection-induced activities. We conducted Low-velocity shear experiments on homogeneous (HM) and layered (LM) clay-quartz mixtures representing gouge heterogeneity under double direct-shear and constant fluid injection. Cyclic fault-valve is activated in LM faults when the clay content is >= 50%, while it is absent in HM faults. A segmental layer of low-permeability clay perpendicular to the flow direction acts as a fault-valve, causing cyclic build-up then dissipation in pore pressure, hence influencing the magnitude of shear stress drop and sliding distance associated with seismic magnitudes. Recovered seismic moments from individual fault-valve cycles are bounded by the maximum seismic moment M0max=c2(1-c)G triangle V ' ${M}_{0}<^>{\max }=\frac{c}{2(1-c)}G\mathit{{\increment}}{V}<^>{\mathit{\prime }}$ when a pre-stress coefficient c ranges 90-99%. This study highlights the role of spatial distributions in pore pressure as controlled by gouge compositions and spatial heterogeneity on slip stability, and verifies the applicability of M0max-triangle V ' ${M}_{0}<^>{\max }-\mathit{{\increment}}{V}<^>{\mathit{\prime }}$ relation to fault-valve systems.