【摘要】 在有关文献资料划分的地震单元基础上,将中国大陆西部地区相邻三个地震亚区的地震活动作为研究对象。对公元1900年以来的MS≥7.0级地震活动分布进行分析,发现地震亚区间具有一定跃迁指向性和非对称迁移现象,并把它作为地震活动大形势判断的依据之一。其中,西藏亚区迁往川甘滇亚区指向性达100%;天山亚区迁往川甘滇亚区指向性达92%。经过了长达10年4次跃迁的检验。更多还原

【Abstract】 According to seismicity regions that relative literatures zone,we discuss the seismic activity and distributions with the magnitude of MS7 or higher in the three adjacent sub-areas in the west of China since A. D. 1900.We find that in these sub-areas the distribution of seismic sequence show a phenomenon of the certain transition directivity and asymmetric migration. These kinds of migrations can be used as one of the judging indexes for general earthquake situation prediction. Among them,the seismic sequences distribute from Tibet sub-region to both Sichuan and Gansu and show a clear directivity. The seismic sequences distribute from Tianshan sub-region to Sichuan,Gansu and Yunnan sub-regions and also show a clear directivity. These predictive indexes are tested by ten years historical earthquake data.更多还原