延矾盆地北缘断裂深浅构造关系研究

STUDY ON RELATIONSHIP BETWEEN DEEP AND SHALLOW STRUCTURES ALONG NORTH BOUNDARY FAULT OF YANQING-FANSHAN BASIN

在已有的地表地质构造、浅层探测与深部探测等资料基础上 ,利用高精度地震局域网的数字地震记录 ,分析了延庆 矾山次级盆地北缘断裂上的微、小地震活动特征 ,及其与地表活断层和深部地壳结构关系 .通过对地震局域网获得的微、小地震的精确位置、震源机制解及其特点的分析 ,厘定了地表活断层延庆 矾山盆地北缘断裂属旋转平面状正断层 ,揭示了延怀盆地区浅表地质与深部构造的相互关系 。

Based on the results of surface geology, shallow and deep seismic survey, featur es of micro-earthquake activity along the north boundary fault of Yanqing-Fans han sub-basin and their relationship with the surface active faults and the dee p-seated crustal structure are analyzed using the recordings from the high-res olution digital local seismic network. The focal mechanism solutions of micro-e arthquakes, whose locations are precisely determined by the local seismic networ k, have confirmed the structural characteristics to be the rotational planar nor mal fault and demonstrated the surface traces of the north boundary fault of Yan qing-Fanshan sub-basin. By using the digital recordings of earthquakes with th e high resolutions and analyzing the mechanism solutions, our study has revealed the relationship between the geological phenomena in the shallow and deep struc tures in Yanqing-Huailai basin and the transition features from the brittle to ductile deformation with the crustal depth.