Simulating Melting in 2D Seismic Fault Gouge

被引:14
作者
Mollon, Guilhem [1 ,2 ]
Aubry, Jerome [2 ]
Schubnel, Alexandre [2 ]
机构
[1] Univ Lyon, LaMCoS, INSA Lyon, CNRS,UMR5259, Lyon, France
[2] PSL Res Univ, Ecole Normale Super, Lab Geol, CNRS,UMR 8538, Paris, France
基金
欧盟地平线“2020”;
关键词
fault gouge; granular mechanics; numerical modeling; partial melting; seismic faults; LOW FRICTIONAL STRENGTH; SHEAR ZONES; RAPID SHEAR; LOCALIZATION; ROCKS; STABILITY; FLOW;
D O I
10.1029/2020JB021485
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
During an earthquake, fault slip weakening is often explained by frictional heating phenomena, generally promoting melt production on the fault surface. Here, we investigate the influence of melt production at the scale of the grains composing a fault gouge. We use a modern version of Discrete Element Modeling able to deal with realistic grain shapes in 2D, and couple it with a Multibody Meshfree Approach able to provide a satisfactory proxy for the mechanical behavior of molten grains. Frictional sliding of solid grains and viscous shearing of molten grains are monitored during simulations. Our results confirm the natural tendency of granular gouge to localize deformation in a thin layer, and thus to trigger local melt production. We also show that the appearance of melt is likely to enhance this localization, and might create a positive feedback to its own production. We propose guidelines for the future writing of a friction model including melting, inspired by these simulation results.
引用
收藏
页数:19
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