Manuele Faccenda, Brandon Paul VanderBeek, Albert de Montserrat, Jianfeng Yang, Neil Ribe
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引用次数: 0
Abstract
Abstract. Mechanical anisotropy related to rock fabrics is a proxy for constraining the Earth’s deformation patterns. However, the forward and inverse modelling of mechanical anisotropy in 3D large-scale domains has been traditionally hampered by the intensive computational cost and the lack of a dedicated, open-source computational framework. Here we introduce ECOMAN, a software package for modelling strain-/stress-induced rock fabrics and testing the effects of the resulting elastic and viscous anisotropy on seismic imaging and mantle convection patterns. Differently from existing analogous software, the modelling of strain-induced fabrics has been extended to all mantle levels and it has been optimised to run across multiple CPUs, yielding strong scaling efficiency. In addition, shape preferred orientation (SPO)-related structures can be modelled and superimposed over lattice/crystallographic preferred orientation (LPO/CPO) fabrics, which allows the consideration of the mechanical effects of fluid-filled cracks, foliated/lineated grain-scale fabrics and rock-scale layering. One of the most important innovations is the Platform for Seismic Imaging (PSI), a set of programs for performing forward and inverse seismic modelling in isotropic/anisotropic media using real or synthetic seismic datasets. The anisotropic inversion strategy is capable of recovering parameters describing a tilted transversely isotropic (TTI) medium, which is required to reconstruct 3D structures and mantle strain patterns and to validate geodynamic models.
摘要与岩石结构相关的力学各向异性是制约地球变形模式的一种替代方法。然而,三维大尺度域中机械各向异性的正演和反演建模历来受制于高昂的计算成本和缺乏专用的开源计算框架。在此,我们介绍 ECOMAN 软件包,该软件包用于模拟应变/应力引起的岩石结构,并测试由此产生的弹性和粘性各向异性对地震成像和地幔对流模式的影响。与现有的类似软件不同的是,应变诱导构造的建模已扩展到所有地幔层,并对其进行了优化,以便在多个 CPU 上运行,从而产生很高的扩展效率。此外,与形状优选取向(SPO)相关的结构也可以建模,并叠加在晶格/晶体学优选取向(LPO/CPO)结构之上,从而可以考虑充满流体的裂缝、叶状/线状晶粒尺度结构和岩石尺度分层的力学效应。最重要的创新之一是地震成像平台(PSI),这是一套利用真实或合成地震数据集在各向同性/各向异性介质中执行正演和反演地震建模的程序。各向异性反演策略能够恢复描述倾斜横向各向同性(TTI)介质的参数,这是重建三维结构和地幔应变模式以及验证地球动力学模型所必需的。
期刊介绍:
Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines:
geochemistry, mineralogy, petrology, volcanology;
geodesy and gravity;
geodynamics: numerical and analogue modeling of geoprocesses;
geoelectrics and electromagnetics;
geomagnetism;
geomorphology, morphotectonics, and paleoseismology;
rock physics;
seismics and seismology;
critical zone science (Earth''s permeable near-surface layer);
stratigraphy, sedimentology, and palaeontology;
rock deformation, structural geology, and tectonics.