摘要:
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PM、壳内中间层PC反射波组,以及结晶基底首波Pg与莫霍界面折射波PN。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。
Abstract:
In recent years, in the region around the cities of Beijing and Tianjin, work of seismic deep sounding has been carried out. The purpose is principally for studying the structure of the crust and upper mantle which involves the earthquake source regions of this seismically active portion of the North China Plain. By observing wide angle reflected waves, the reflection PM from the Mohorovicic Discontinuity and PM from the intermediate layer within the crust are recorded. Eefracted waves from the Mohorovicic Discontinuity have been observed. Assuming a horizontally homogeneous layered structural model, computations of the velocity structure by the damped least square method of inversion were done. Eesults show that apparently, in this entire region velocity varies with depth, as a layered earth. On the other hand, horizontal inhomogenuity actually exists.
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