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首页> 外文期刊>Earth, planets and space: EPS >Finite element analysis of crustal deformation in the Ou Backbone Range, northeastern Japan, with non-linear visco-elasticity and plasticity: effects of non-uniform thermal structure
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Finite element analysis of crustal deformation in the Ou Backbone Range, northeastern Japan, with non-linear visco-elasticity and plasticity: effects of non-uniform thermal structure

机译：具有非线性粘弹和塑性的日本东北大骨山脉范围内地壳变形的有限元分析：非均匀热结构的影响

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摘要

A finite element analysis with non-linear visco-elasticity and plasticity was carried out with the aim of constructing a model of the slip and deformation processes in the deeper parts of the seismogenic zones of inland earthquakes. Our finite element code is based on the GeoFEM parallel finite element code and was developed using plug-ins to adopt several non-linear functions. We consider the effects of geothermal structures in the crust in a compressional tectonic setting to model the deformation and faulting that occur around the Ou Backbone Range in northeastern Japan. We set an area of high geothermal gradient in the center of the model. The numerical results show that shortening deformation due to non-linear viscous flow occurs in the high-temperature area in the lower part of the crust, which results in shear faulting in the upper part of the crust. In the case where the crust comprises two layers—the upper crust (quartz diorite) and the lower crust (wet diabase)—a weak viscous zone appears in the lower part of the upper crust and a strong viscous or plastic zone appears at the upper part of the lower crust. Our numerical results are able to explain the deformation and faulting that occur around the Ou Backbone Range in northeastern Japan.
机译：为了建立内陆地震发震区深部的滑动和变形过程模型，进行了非线性粘弹和塑性有限元分析。我们的有限元代码基于GeoFEM并行有限元代码，并且是使用插件开发的，以采用多种非线性函数。我们考虑了在压缩构造环境中地壳中地热结构的影响，以模拟日本东北部Ou主干山脉周围发生的变形和断层。我们在模型的中心设置了一个高地热梯度的区域。数值结果表明，在地壳下部的高温区域，由于非线性粘性流引起的变形缩短，导致了地壳上部的剪切断裂。如果地壳包括两层，即上地壳（石英闪长岩）和下地壳（湿辉绿岩），则在上地壳的下部会出现一个弱粘性区域，而在上地壳会出现一个强粘性或塑性区域下地壳的一部分。我们的数值结果能够解释日本东北部Ou骨干山脉周围发生的变形和断层。

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