云南及邻区环境剪应力场时间分布与强震活动

Time Distribution of Environmental Shear-stress Field and Macroseismicity in Yunnan and the Neighbouring Region

对云南及邻区环境剪应力场时间变化作了分析研究 ,表明因高剪应力值地震在时间上的集中分布 ,而形成了环境剪应力场显著增强的时段。高剪应力值地震的发生是构造应力场增强的直接表征 ,环境剪应力场高值分布区和高剪应力值地震集中发生时段的出现 ,与强震活动的时空分布密切相关。追踪分析环境剪应力场的时间变化 ,是地震危险性中、短期预测的行之有效的一种方法。环境剪应力场不同时间段的变化 。

The variation of the environmental shear-stress field with time in Yunnan and the neighbouring region is studied.The earthquakes with high shear-stress values clustered in an interval caused the period in which the environmental shear-stress field notably enhanced.The occurrence of earthquakes with high shear-stress values is the obvious symbol of enhancement of tectonic stress field.The areas where the high shear-stress value distributes and the periods in which the earthquakes with high shear-stress values cluster are closely related to the spatio-temporal distribution of strong seismic activity.So, analyzing the variation of the environmental shear-stress field with time is an effectual method to the medium and short-term earthquake prediction.The different variation of the environmental shear-stress field in different period of time may be a criterion for the medium and short-term earthquake prediction.