粘滑和稳滑实验条件下石英岩的某些显微形貌特征及其地震地质意义

本文利用石英岩在围压1—5千巴,轴向应变率4.4×10~(-5)/秒的条件下,产生粘滑和稳滑运动,应用扫描电镜(SEM)观察研究试样中破裂剪切滑动面的形貌特征。指出,粘滑运动具有快速剪切破裂滑动和撞击的形貌特征,稳滑运动则表现出缓慢揉裂和搓剪的形貌特征。这些特征与活断层产物中的某些形貌特征可对比。这对判别断层粘滑或稳滑活动形式,具有一定的实践意义

SOME SEM MICROTEXTURES OF QUARTZITE FROM STICK-SLIP AND STEADY STATE SLIP EXPERIMENTS AND THEIR SEISMOGEOLOGICAL SIGNIFICANCE

Some Scanning Electron Microscopy (SEM) microtextures have been observed on the products of quartzite from triaxial compression experiments with a confining pressure of 1-5 Kb and a strain rate of 4.4×10-5/sec.The SEM microtextures resulting from stick-slip are distinguishable from those resulting from steady-state slip.The former shows the characteristics of bashing and shearing fracture or rapid slipping,and the latter demonstrates those associated with rubbing fracture and slow shearing.The SEM mic-rotextures in products from active faults can be compared with those from experiments.It is significant to distinguish between stick-slip and steady-state slip motion of active iaults by using these typical SEM microtextures