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 structureReport as inadecuate




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 - Download this document for free, or read online. Document in PDF available to download.

Earth, Planets and Space

, Volume 59, Issue 6, pp 499–512

First Online: 27 June 2007Received: 13 February 2006Revised: 04 December 2006Accepted: 15 January 2007

Abstract

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.

Key wordsGeoFEM crustal deformation non-linear visco-elasticity plasticity thermal structure Ou Backbone Range  Download to read the full article text



Author: Bunichiro Shibazaki - Kazuteru Garatani - Hiroshi Okuda

Source: https://link.springer.com/







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