Stability Analysis of Creeping Faults: The Role of Chemical Decomposition of Minerals

被引：0
|
作者：
Sulem, Jean [1 ]
Brantut, Nicolas [1 ]
机构：
[1] Ecole Ponts ParisTech, CNRS, UMR 8205, CERMES UR Navier, Marne La Vallee, France
来源：
ADVANCES IN BIFURCATION AND DEGRADATION IN GEOMATERIALS | 2011年
关键词：
Fault mechanics; Shear heating; Dehydration of minerals; Chemo-mechanical couplings; Seismic slip; PORO-MECHANICAL PROPERTIES; GOUGE;
D O I：
10.1007/978-94-007-1421-2_13
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
The stability of creeping faults is studied under the effect of shear heating, pore fluid pressurization and mineral decomposition. Such reactions enhance the pore fluid pressurization because they release fluid, but they limit the temperature rise because they are endothermic. The stability of stationary slip is investigated by performing a linear perturbation analysis. It is shown that chemical reactions change a stable behaviour into an unstable one when the pore pressure effect is larger than the endothermic effect. It is shown that the opposite effect can also be observed when the dehydration reactions can trigger an arrest of the fault. Mineral decomposition can thus strongly modify the nucleation of seismic slip.
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页码：101 / 107
页数：7
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