气候变化领域集成服务门户(CCPortal): Competition between slow slip and damage on and off faults revealed in 4D synchrotron imaging experiments

CCPortal

DOI	10.1016/j.tecto.2020.228437
	Competition between slow slip and damage on and off faults revealed in 4D synchrotron imaging experiments
	Renard F.; McBeck J.; Cordonnier B.
发表日期	2020
ISSN	00401951
卷号	782-783
英文摘要	In the continental crust, faults may accommodate deformation through aseismic creep, slow slip events, or seismic slips that produce dynamic damage, or a combination of these endmembers. A variety of parameters controls the occurrence of these mechanical behaviors. In a series of laboratory experiments, we image centimeter-scale faults during sliding under in situ conditions. We perform four experiments of slip on centimeter-scale crystalline rock samples prepared with a saw-cut interface at 45° from the direction to the maximum compressive stress and at stress conditions of 2–3 km depth. We image fault slip and off-fault fracture development using 4D synchrotron X-ray microtomography. Three faults have an initial rough interface, and deformation occurs with increasing differential stress by a combination of slow slip events and off-fault damage, until catastrophic failure and the formation of new faults. Conversely, the pre-cut fault with a smooth initial surface deforms mainly by slow slip, develops numerous striations along its slip plane, and no microfractures are detected in the wall rock. Our experiments reproduce aseismic and seismic faulting behavior, and demonstrate that the roughness of the fault plane is one of the parameters that control the transition between these two behaviors. A fault with a rougher interface may tend to develop more off-fault damage and seismic behavior. For the rough fault experiments, the secondary faulting occurs along a network of faults oriented at high angles from the pre-existing saw-cut plane, a behavior similar to several earthquake sequences that occurred along orthogonal faults. © 2020 Elsevier B.V.
英文关键词	Compressive stress; Deformation; Rock mechanics; Seismology; Catastrophic failures; Continental crusts; Differential stress; Earthquake sequences; Laboratory experiments; Mechanical behavior; Synchrotron imaging; Synchrotron X-ray microtomography; Fault slips; compression; continental crust; deformation mechanism; experimental study; faulting; four-dimensional modeling; image analysis; slip rate; stress field
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207859
作者单位	Physics of Geological Processes, The Njord Centre, Department of Geosciences, University of Oslo, Oslo, Norway; University Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, 38000, France
推荐引用方式 GB/T 7714	Renard F.,McBeck J.,Cordonnier B.. Competition between slow slip and damage on and off faults revealed in 4D synchrotron imaging experiments[J],2020,782-783.
APA	Renard F.,McBeck J.,&Cordonnier B..(2020).Competition between slow slip and damage on and off faults revealed in 4D synchrotron imaging experiments.Tectonophysics,782-783.
MLA	Renard F.,et al."Competition between slow slip and damage on and off faults revealed in 4D synchrotron imaging experiments".Tectonophysics 782-783(2020).