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采用断层位错模式,考虑了具有一定宽度的断层在其粘滑过程中,断层摩擦应力和滑动速度随粘滑过程的变化情况,由此计算了粘滑所产生的摩擦增温,并将结果与不考虑摩擦应力变化、不考虑滑动速度变化或忽略断层宽度时的情况作了比较。结果表明:断层滑动时,摩擦应力和滑动速度随时间的改变及断层的宽度将对断层摩擦增温产生较大影响。由于岩石中孔隙和孔隙流体的存在,摩擦应力在断层粘滑过程中有较大变化。取断层滑动速度为Brune 震源时间函数形式,考虑摩擦应力的变化及一定的断层宽度,计算得到的摩擦增温值较以往的计算结果偏小。这个结论对测定断层活动年代的热释光(TL)和电子自旋共振(ESR) 法具有一定的理论指导意义。
By using the fault dislocation model, the change of frictional stress and sliding velocity of the fault with a certain width during the stick-slip process is considered, and the frictional warming caused by the stick-slip is calculated. The result Comparisons were made with or without considering changes in frictional stress, regardless of changes in slip velocity or width of slip. The results show that the change of frictional stress and sliding velocity with time and the width of fault will have a great influence on the frictional temperature increase of fault when the fault slips. Due to the presence of pores and pore fluids in the rock, the frictional stresses greatly change during the stick-slip process. Taking slip velocity of fault as a function of Brune source time, considering the change of frictional stress and the width of fault, the calculated frictional temperature increase value is smaller than the previous one. This conclusion is of theoretical significance for the determination of thermoluminescence (TL) and electron spin resonance (ESR) methods in the era of fault activity.