1725年康定7(1/2)级地震发震构造问题的讨论

A DISCUSSION ON THE STATUTORY OF THE 1725 KANGDING EARTHQUAKE WITH M=7.5

公元1725年康定7~1/2级地震,至今其震中及发震构造尚未定论。通过历史地震记载资料以及发震地区地震与地震形变带的对比分析,认为这次地震归属鲜水河断裂带无疑,而且应是该断裂带南段色拉哈分支断裂上的地震,震中在龙启马沟—色拉哈一带,称之为色拉哈地震。同时认为,这一发震段现今为一明显的大震空段,仍潜存着大震发生的危险。

Up to now,the epicenter and statutory of the 1725 Kangding earthquake with M=7.5 have not been determined clearly.Based on the litereature data about historical earthquakes and analysis results of the earthquakes in causative area and the seismic deformation belts. We believe that the earthquake belongs to the Xianshuihe fault zone without question.The earthquake might occur within Selaha branch fault in the southern segment of the Xianhuihe fault zone,and its epicenter was located in the zone along Magou,Longqi and Selaha,so we can call it Selaha earthquake.Meanwhile,we hold that this causative segment is recently a clear gap of strong earthquakes,so there is still potential risk of strong earthquake in the segmnt.