Nondimensional control parameters governing the behavior of 1-D fault slip : effects of shear heating, inelastic pore creation and fluid flow
Nondimensional control parameters governing the behavior of 1-D fault slip : effects of shear heating, inelastic pore creation and fluid flow
复制标题
控制一维断层滑动行为的无量纲控制参数：剪切加热、非弹性孔隙生成和流体流动的影响
DOI：
10.1029/2009jb006557
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. and T. Yamashita
中科院分区：
文献类型：
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作者：
Suzuki;T. and T. Yamashita
我们从理论上研究了一维断层的动态滑动，考虑了包括剪切加热、流体流动和非弹性孔隙产生在内的热孔隙弹性效应。我们发现系统行为的定性本质可以用三个无量纲参数Su，S′u和P *0来理解。Su代表非弹性孔隙形成对流体压力变化的影响相对于剪切加热的影响占主导地位，而S ′ u则代表流体流动对剪切加热的影响占主导地位。参数P * 0表示初始流体压力。我们分别在Su < −P* 0和Su> −P*0范围内观察到滑移弱化和滑移强化行为，而与S ′u的值无关。利用该模型可以全面地认识断层的快速滑动和慢速滑动。一般的高速断层滑动，只要Ss略大于−P*0，S′小于下限，σ s 0 <$100 MPa即可模拟。我们需要Su −P*0的条件，S ′u的值足够大，σ s 0的值足够小，以模拟更慢的断层滑动。我们目前的研究还提供了一个模型的机制，可以忽略不计的摩擦加热的圣安德烈亚斯故障。我们实际上发现，如果σ s 0和S ′ u足够小和/或S ′ u明显大于一个阈值，则断层上的温升在滑移强化范围内可以忽略不计。
We theoretically study the dynamic slip of a one‐dimensional fault considering thermoporoelastic effects including shear heating, fluid flow, and inelastic pore creation. We find that the qualitative nature of system behavior can be understood in terms of three nondimensional parameters:Su,S′u, andP*0. The parameterSurepresents the relative dominance of the effect of inelastic pore creation on the fluid pressure change over that of shear heating, whileS′uis associated with the dominance of the fluid flow effect over the effect of shear heating. The parameterP*0denotes the initial fluid pressure. We observe the slip‐weakening and slip‐strengthening behaviors in the rangesSu< −P*0andSu> −P*0, respectively, irrespective of the value ofS′u. We can understand both fast and slow fault slips comprehensively on the basis of our model. Ordinary high‐speed fault slip can be simulated withSuslightly larger than −P*0,S′unear the lower limit, andσs0∼ 100 MPa. We need the conditions ofSu≫ −P*0, sufficiently large values forS′u, and sufficiently smaller values forσs0to model much slower fault slip. Our present study also provides a model for the mechanism of negligible frictional heating on the San Andreas fault. We actually found that the temperature rise on the fault is negligibly low in the range of slip strengthening if the values ofσs0andS′uare small enough and/or the value ofSuis significantly larger than a threshold.