Journal article

Improving subduction interface implementation in dynamic numerical models

Dan Sandiford, Louis Moresi

SOLID EARTH | COPERNICUS GESELLSCHAFT MBH | Published : 2019

Abstract

Numerical subduction models often implement an entrained weak layer (WL) to facilitate decoupling of the slab and upper plate. This approach is attractive in its simplicity, and can provide stable, asymmetric subduction systems that persist for many tens of millions of years. In this study we undertake a methodological analysis of the WL approach, and use these insights to guide improvements to the implementation. The issue that primarily motivates the study is the emergence of significant spatial and temporal thickness variations within the WL. We show that these variations are mainly the response to volumetric flux gradients, caused by the change in boundary conditions as the WL material e..

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University of Melbourne Researchers

Grants

Awarded by Centre of Excellence for Core to Crust Fluid Systems, Australian Research Council


Funding Acknowledgements

This research has been supported by the Centre of Excellence for Core to Crust Fluid Systems, Australian Research Council (grant no. DP150102887). Dan Sandiford's postgraduate research at the University of Melbourne was supported by a Baragwanath Geology Research Scholarship.