论文部分内容阅读
近几年来,京津及其外围地区开展了地震测深工作。其目的主要是研究地震监视区和震源区的地壳和上地幔结构。用点测深方法观测宽角度反射波;莫霍界面反射波P_M、壳内中间层P_C反射波组,以及结晶基底首波P_8与莫霍界面折射波P_N。选用水平均匀分层介质地壳结构模式,应用阻尼最小二乘法反演速度结构。结果表明,该区速度随深度有较明显的成层分布规律,同时也说明该区速度横向不均匀性是存在的。
In recent years, seismic sounding has been carried out in Beijing, Tianjin and its outlying areas. Its main purpose is to study the crust and upper mantle structure in the seismic monitoring area and source area. Point-echo method was used to observe the wide-angle reflection wave; the Moho interface reflection wave P_M, the in-shell P_C reflection wave group, the crystal matrix first wave P_8 and the Moho interface refraction wave P_N. The crustal structure model of horizontal uniform layered media is selected, and the velocity structure is retrieved by the least square method of damping. The results show that the velocity of the area has obvious stratification rules with depth, and it also shows that the lateral velocity nonuniformity exists in this area.