首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Interaction of faults and perturbation of slip: influence of anisotropic stress states in the presence of fault friction and comparison between Wallace-Bott and 3D Distinct Element models
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Interaction of faults and perturbation of slip: influence of anisotropic stress states in the presence of fault friction and comparison between Wallace-Bott and 3D Distinct Element models

机译:断层相互作用和滑动扰动:存在断层摩擦力时各向异性应力状态的影响以及Wallace-Bott模型和3D离散元模型的比较

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Two decades after their birth, the validity of fault slip inversion methods is still strongly debated. These methods are based upon a very simplified mechanical background, the Wallace-Bott hypothesis. Following previous studies, the 3D Distinct Element Method (3DEC software) is used to explore the effect of varying stress anisotropy (i.e. the "shape" ratio) on slip perturbation along pairs of faults. Two end-member configurations are modelled in taking into account fault friction and internal deformation of faulted blocks. The first model deals with a relatively simple case where two nonintersecting conjugate normal faults are reactivated in an oblique normal stress regime. The second one simulates an extreme situation where two perpendicular intersecting faults are submitted to oblique extension. The average direction of fault slip predicted by 3DEC models is compared to the corresponding slip predicted by the simplified Wallace-Bott model. For the two simulated cases, it is shown that results from 3DEC and Wallace-Bott models are mutually consistent and argue for the validity of fault slip data inversion methods. Consistency remains even if slip is significantly deviated near the intersection line of faults. These deviations depend on the degree of anisotropy of applied stresses in presence of fault friction. Furthermore, modelling results suggest that, for intersecting faults with convergent slip directions, consideration of fault friction in the models leads to reduction of slip perturbation. In other words, modelling results lead to the nonintuitive conclusion that the validity of the simplified Wallace-Bott model is strengthened when 3DEC model's complexity (i.e. the number of parameters incorporated) increases. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 43]
机译:断层滑动反演方法诞生后的二十年,仍在激烈争论。这些方法基于非常简单的机械背景,即Wallace-Bott假设。在进行了先前的研究之后,使用3D离散元方法(3DEC软件)来探索变化的应力各向异性(即“形状”比)对沿断层对滑动扰动的影响。考虑到故障摩擦和故障块的内部变形,对两个端部构件配置进行建模。第一个模型处理的是一个相对简单的情况,其中两个非相交的共轭正断层在斜向正应力状态下被重新激活。第二个模拟了一种极端情况,其中两个垂直相交的断层被斜交。将3DEC模型预测的断层滑动的平均方向与简化的Wallace-Bott模型预测的相应滑动进行比较。对于这两种模拟情况,表明3DEC模型和Wallace-Bott模型的结果相互一致,并证明了断层滑动数据反演方法的有效性。即使在断层相交线附近滑移明显偏离,仍保持一致性。这些偏差取决于存在断层摩擦时所施加应力的各向异性程度。此外,建模结果表明,对于与收敛的滑动方向相交的断层,在模型中考虑断层摩擦会减少滑动扰动。换句话说,建模结果导致一个非直觉的结论,即当3DEC模型的复杂性(即合并的参数数量)增加时,简化的Wallace-Bott模型的有效性得到增强。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:43]

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