摘要
According to the earthquake focal mechanism solutions of 55 moderately strong earthquakes onthe northeastern side of Pamirs,the spatial and temporal distribution of earthquakes ith M_s≥6.0 since this century and the characteristics of hypocenter depth distribution of earthquakeswith M_s≥3.0 since 1980 in this region,the article discusses the relation between regional tee-tonic stress fields and strong earthquake activity.The result shows that the hypocenter disloca-tion is mostly strike-dip,partly dip-slip,and the direction of the principal compressional stressis nearly NS.The distributive characteristics of strong shock activity is obvious,with the gen-eral trend that the west is strong and the east is weak,which can be divided into three imephases,and each with relative principal active region The depth near Pamirs aren reaches200km,shallower obviously when externding to NE,less than or equal to 40km near the Kalpinblock,and the article discusses the result.
According to the earthquake focal mechanism solutions of 55 moderately strong earthquakes on the northeastern side of Pamirs, the spatial and temporal distribution of earthquakes with Ms ≥6.0 since this century and the characteristics of hypocenter depth distribution of earthquakes with Ms≥3.0 since 1980 in this region, the article discusses the relation between regional tectonic stress fields and strong earthquake activity. The result shows that the hypocenter dislocation is mostly strike-dip, partly dip-slip, and the direction of the principal compressional stress is nearly NS. The distributive characteristics of strong shock activity is obvious, with the general trend that the west is strong and the east is weak, which can be divided into three time phases, and each with relative principal active region. The depth near Pamirs arch reaches 200km, shallower obviously when extending to NE, less than or equal to 40km near the Kalpin block, and the article discusses the result.
基金
This research was sponsored by the National Key Basic Research Program under grant No. G1998040705 and National Key Scientific Program (96-913-07-04). China.
