【摘要】 本文主要叙述利用近年来北京及其附近地区八次工业爆破的观测资料,同时也利用了一部份天然地震的资料来研究北京—天津—唐山—张家口地区地壳结构的结果,采用了工业爆破中的58个观测点和天然地震的54个观测点的数据,得到了本区的三层地壳模型和地壳厚度。 地壳的平均厚度分布各地区不很一致;北京及其东南地区为35±1.5公里,北部地区为37±1.0公里,西部地区为39±1.5公里,地壳介质中的纵波和横波的平均速度分别为6.23±0.03公里/秒和3.55±0.05公里/秒,上地幔顶部介质的平均速度为7.98±0.13公里/秒和4.60±0.03公里/秒。更多还原

【Abstract】 In this paper results are presented for the investigation of the deep crustal structure of the Beijing-Tianjin-Tangshan-Zhangjiakou region, using the data obtained in and around Beijing during 1971-1975 from 8 industrial explosions and several earthquakes which occurred in this region. Data of 58 observation points for industrial explosions and 54 observation points for earthquakes were used in the com-putation. A three-layer model of the crust was obtained for this region.The average crustal thicknesses of different portions of the region are not the same. In Beijing and the area Southeast of it, the thickness of the crust amounts to 35 ± 1.5km, while north of Beijing, it is 37 ± 1.5km, and west of Beijing, it is 39±1.5km. The average velocities of the compressional and transversal waves are respectively 6.23 ± 0.03 km/s, and 3.55 ± 0.05 km/s, and they are 7.98 ± 0.13 km/s and 4.60 ± 0.03 km/s for the uppermost part of the mantle.更多还原