气候变化领域集成服务门户(CCPortal): Predicting the propagation and interaction of frontal accretionary thrust faults with work optimization

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DOI	10.1016/j.tecto.2020.228461
	Predicting the propagation and interaction of frontal accretionary thrust faults with work optimization
	McBeck J.; Cooke M.; Fattaruso L.
发表日期	2020
ISSN	00401951
卷号	786
英文摘要	This study uses work optimization to predict the spatial and temporal development of faults. We focus on the growth of small fractures that develop into thrust faults at the toe of accretionary prisms because observations from physical laboratory accretion experiments provide rich data with which to validate the models, and the processes of accretionary thrust fault initiation remain unclear. In order to model these systems, we apply new implementations to the fault growth code GROW that improve its prediction of fault interaction using work optimization, including: 1) CPU parallelization, 2) a new growth algorithm that propagates only the most efficient fault in each growth increment, the single run mode, and 3) a new growth algorithm that only considers fault propagation from fault tips that host high sums of modes I and II stress intensity factors, KG, the limiting mode. The new single and limiting mode produce the geometries that best match the observed geometries, rather than the algorithm that allows all the faults to propagate simultaneously, regardless of KG, the multiple and non-limiting mode. The single limiting models predict that frontal accretionary thrusts initiate at the midpack or shallower depths, consistent with findings of previous studies. The thrusts propagate upward, link with the surface, and then propagate downward and link with the detachment. The backthrust tends to propagate before the forethrust, and then influences the forethrust propagation. This temporal and spatial sequence of faulting arises from the lower compression, higher shear strain, higher Coulomb stress and higher strain energy density that develop near the wedge surface and the inflection of the wedge slope. The models reveal that the final slip distributions do not reliably indicate the initiation location of the faults, in contrast to widespread assumptions. © 2020 Elsevier B.V.
关键词	Accretionary prisms Numerical simulations Thrust fault growth Work optimization
英文关键词	Forecasting; Laboratories; Shear strain; Strain energy; Structural geology; Accretionary prism; Fault interactions; Fault propagation; Growth algorithms; Physical laboratory; Strain energy density; Temporal and spatial; Temporal development; Faulting; accretion; accretionary prism; algorithm; fault geometry; fault propagation; faulting; fracture; optimization; prediction; thrust fault
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/207827
作者单位	Physics of Geological Processes, The Njord Centre, Department of Geosciences, University of Oslo, Norway; Department of Geosciences, University of Massachusetts AmherstMA, United States
推荐引用方式 GB/T 7714	McBeck J.,Cooke M.,Fattaruso L.. Predicting the propagation and interaction of frontal accretionary thrust faults with work optimization[J],2020,786.
APA	McBeck J.,Cooke M.,&Fattaruso L..(2020).Predicting the propagation and interaction of frontal accretionary thrust faults with work optimization.Tectonophysics,786.
MLA	McBeck J.,et al."Predicting the propagation and interaction of frontal accretionary thrust faults with work optimization".Tectonophysics 786(2020).