断层摩擦系数及其演化定量研究的新途径

A NEW WAY OF QUANTITATIVE STUDY ON THE FAULT FRICTION COEFFICIENT AND ITS EVOLUTION

摘要:

在活断层的力学性质参数中,摩擦系数有着特别重要的意义.它是建立活断层运动学与动力学之间物理力学关系进而促进地震地质研究沿着"由静到动、由定性到定量"方向深入发展的关键性参数之一,也是建立活断层重新滑动准则从而定量评估断层稳定性或地震危险性不可缺少的物理参数.目前,断层摩擦系数主要是应用双剪法对采自断层的断层泥进行实验室测试和研究而取得的.这样取得的结果很难说能够代表断层实际摩擦系数,尤其很难反映断层深部摩擦性状,采用实验室方法是无法测知不同地质时期断层活动所显示的摩擦性状及其演化特征的.因此,必须寻找定量确定断层摩擦系数及其演化特征的新途径.通过理论研究和实际应用提出了根据对活断层运动学实测资料的分析并结合年代学测试定量确定断层摩擦系数和动力学主要参数及其演化特征的新途径.

Abstract:

Of the mechanical parameters of active faults,friction coefficient holds special importance in establishing the kinematic and dynamic relationships of active faults and in establishing the criteria of fault reslipping.Now,the friction coefficient is generally got from gouge test by using the double shear method.It is difficult to detemine whether the result from this test can reflect the real situation of the faults.So it is necessary to find out a new way for quantitatively determining the fault friction coefficient and its evolution.Based on theoretical study and practice,such a new method is put forward by using fault kinematic and dating data.