Experimental study on nucleation process of stick-slip instability on homogeneous and non-homogeneous faults

作     者：MA Shengli LIU Liqiang MA Jin WANG Kaiying HU Xiaoyan LIU Tianchang WU Xiuquan 

作者机构：Institute of Geology and Laboratory of Tectonophysics China Seismological Bureau Beijing 100029 China 

出 版 物：《Science China Earth Sciences》 (中国科学(地球科学英文版))

年 卷 期：2003年第46卷第Z2期

页      面：56-66页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：国家重点基础研究发展计划(973计划)(G1998040704) 

主　　题：friction experiment stick-slip nucleation process homogeneous fault non-homogeneous fault. 

摘      要：The nucleation process of stick-slip instability was analyzed based on the experimental measurements of strain and fault slip on homogeneous and non-homogeneous faults. The results show that the nucleation process of stick-slip on the homogeneous fault is of weak slip-weakening behavior under constant loading point velocity. The existence of a short weak segment on the fault makes slip-weakening phenomenon in nucleation process more obvious, while the existence of a long weak segment on the fault makes the nucleation process changed. The nucleation is characterized by accelerating slip in a local region and rapid increase of shear stress along the fault in this case, which is more coincident with the rate and state friction law. During the period when fault is locked, increasing of shear stress causes lateral elastic dilation near the fault, and the rebound of the dilation at the time of instability causes an instantaneous increase of normal stress in the fault plane, which is an important factor making fault be rapidly locked and its strength recovered.