现代地质2017，Vol.31Issue(4)：869-876,8.
基于地应力实测数据分析郯庐断裂带中段滑动趋势
Slip Tendency Analysis of the Mid-segment of Tan-Lu Fault Belt Based on Stress Measurements
摘要
Abstract
The slip tendency of Tan-Lu fault belt is of great importance for regional crustal stability evaluation.The ranges of the ratios of the maximum and minimum horizontal stresses to vertical stresses are obtained by analyzing in-situ stress data from 12 boreholes in the vicinity of the mid-segment of Tan-Lu fault belt (from Xinyi to Bohai).The results show that the stress state of the mid-segment of Tan-Lu fault belt is predominantly reverse faulting and partly strike-slip faulting.The stress ratio K increases gradually from west to east and reaches the maximum value in the northeast of the study area.The calculated ratio of shear stress to effective normal stress on fault planes is smaller than the frictional coefficient defined by the Byerlee's law,which indicates that the mid-segment of Tan-Lu fault belt is in a relatively stable state nowadays.Meanwhile,the ratios of shear stress to effective normal stress of the northwestern striking fault are bigger than those of the northeastern striking fault.The results of stress accumulation indexμm in this area and the distribution characteristics of earthquakes reveal that earthquakes are more likely to occur along the northwest-striking faults of the mid-segment of Tan-Lu fault belt,and the degree of stress accumulation near the northwest-striking faults is low.On the contrary,the degree of stress accumulation along the northeast-striking faults is high,especially along the northeast-striking faults in the northeastern part of the mid-segment of Tan-Lu fault belt,and the seismic gap occurs in this stress-accumulating area which is speculated as a deadlocking zone.As a result,it is concluded that the mid-segment of TanLu fault belt is more likely to slip along the north-west direction.关键词
地应力/郯庐断裂带中段/摩擦系数/滑动趋势Key words
in-situ stress/the mid-segment of Tan-Lu fault belt/frictional coefficient/slip tendency分类
天文与地球科学引用本文复制引用
刘卓岩,王成虎,徐鑫,慎乃齐,贾晋..基于地应力实测数据分析郯庐断裂带中段滑动趋势[J].现代地质,2017,31(4):869-876,8.基金项目
国家自然科学基金项目(41274100,41574088) （41274100,41574088）
中央级科研院所基本科研业务项目(ZDJ2012-20). （ZDJ2012-20）
