Abstract:

The study of regenerated microstructures of fault gouge formed under triaxial friction experiment and natural gouges indicates a certain relationship between microstructure features and fault slip mode.The samples subject to stable slip exhibits the fault gouge to be uniformly deformed,resulting in low Riedel shear angles(<14?)and cataclastic flow structure. When the samples were subject to stick slip,the fault gouge was locally stronglydeformed,and random cracks were formed at a high Riedel shear angle(>14?).The regenerated microstruc-tures in natural fault gouge zones may also surves as a potential tool for identifing paleoearthquakes.

Key words: Fault gouge, Microstructure, Fault behavior

摘要：

三轴剪切摩擦实验后的断层泥与天然断层泥的再生显微结构特征研究表明,断层泥的显微结构特征与断层滑动方式之间有一定的关系,稳滑使断层泥变形均匀,产生低角度剪切(<14°)、布丁构造和颗粒碎裂流动。粘滑使断层泥局部发生强烈变形、高角度剪切(>14°)和碎粒出现随机裂纹等。断层泥的再生显微结构特征可用作鉴别古地震的存在。

关键词: 断层泥, 显微构造, 断层性状