气候变化领域集成服务门户(CCPortal): Nucleation of Stick-Slip Instability Within a Large-Scale Experimental Fault: Effects of Stress Heterogeneities Due to Loading and Gouge Layer Compaction

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DOI	10.1029/2019JB018429
	Nucleation of Stick-Slip Instability Within a Large-Scale Experimental Fault: Effects of Stress Heterogeneities Due to Loading and Gouge Layer Compaction
	Buijze L.; Guo Y.; Niemeijer A.R.; Ma S.; Spiers C.J.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Geodetic observations and large-scale laboratory experiments show that seismic instability is preceded by slow slip within a finite nucleation zone. In laboratory experiments rupture nucleation is studied mostly using bare (rock) interfaces, whereas upper crustal faults are typically filled with gouge. To investigate effects of gouge on rupture nucleation, we performed a biaxial shearing experiment on a 350 mm long saw-cut fault filled with gypsum gouge, at room temperature and a minimum horizontal stress σ2 = 0.3–5 MPa. The gouge layer was sandwiched between polymethylmethacrylate (PMMA) plates For reference also a fault without gouge was deformed. Strain gauges and Digital Image Correlation were used to monitor the deformation field along the fault zone margins. Stick-slip behavior occurred on both the gouge-filled fault and the PMMA fault. Nucleation of instability on the PMMA fault persistently occurred from one location 2/3 to 3/4 along the fault adjacent to a slow slip zone at the fault end, but nucleation on the gouge-filled fault was more variable, nucleating at the ends and/or at approximately 2/3 along the fault, with precursory slip occurring over a large fraction of the fault. Nucleation correlated to regions of high average fault stress ratio τ/σn, which was more variable for the gouge-filled fault due to small length scale variations in normal stress caused by heterogeneous gouge compaction. Rupture velocities and slip rates were lower for the gouge-filled fault than for the bare PMMA fault. Stick-slip persisted when σ2 was lowered and the nucleation zone length increased, expanding from the center to the sample ends before transitioning into instability. ©2020. The Authors.
英文关键词	gypsum gouge; large-scale experimental faults; nucleation of stick-slip instability; PMMA; rupture nucleation
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/187681
作者单位	High Pressure Temperature Laboratory, Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Applied Geosciences, Energy Transition, TNO, Utrecht, Netherlands; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China
推荐引用方式 GB/T 7714	Buijze L.,Guo Y.,Niemeijer A.R.,et al. Nucleation of Stick-Slip Instability Within a Large-Scale Experimental Fault: Effects of Stress Heterogeneities Due to Loading and Gouge Layer Compaction[J],2020,125(8).
APA	Buijze L.,Guo Y.,Niemeijer A.R.,Ma S.,&Spiers C.J..(2020).Nucleation of Stick-Slip Instability Within a Large-Scale Experimental Fault: Effects of Stress Heterogeneities Due to Loading and Gouge Layer Compaction.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Buijze L.,et al."Nucleation of Stick-Slip Instability Within a Large-Scale Experimental Fault: Effects of Stress Heterogeneities Due to Loading and Gouge Layer Compaction".Journal of Geophysical Research: Solid Earth 125.8(2020).