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对武清—北京—赤城剖面段的人工地震测深资料,利用常规地震测深方法进行处理与计算,目的是查明该地区二维地壳速度结构和构造的基本特征、断层的空间展布特征和深浅部地质构造环境等.结果表明,不同区域的地壳速度结构在纵向和横向上均具有明显的非均匀性.地壳呈层状结构,地壳厚度由武清的31.0 km向北西至延庆逐渐加厚为40.0 km.在北京下方壳内界面起伏较大,莫霍面在北京的北西方向有一急剧加深,在约20 km范围内M面起伏变化达5.0 km.根据地震波动力学与运动学特征,以及二维地壳速度等值线和地震界面起伏变化等特征,沿剖面推测了5条地壳浅部断裂.
The artificial seismic sounding data of Wuqing-Beijing-Chicheng profile section are processed and calculated by conventional seismic sounding method in order to find out the basic characteristics of the two-dimensional crustal velocity structure and structure and the spatial distribution of faults And the tectonic setting in the shallow depths, etc. The results show that the crustal velocity structures in different regions have obvious inhomogeneities in both vertical and horizontal directions, and the crust has a layered structure with the thickness of the crust gradually increasing from 31.0 km in Wuqing to 10 km in northwest to Yanqing With a thickness of 40.0 km. In the lower part of Beijing, there is a large fluctuation in the inner shell surface, with a sharp deepening of the northwestern Moho in Beijing and a fluctuation of 5.0 km in an area of about 20 km. According to seismic wave dynamics and kinematics, And two-dimensional crustal velocity contours and seismic interface fluctuations and other characteristics, along the profile of 5 crustal shallow fracture.