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本文根据北京地震台网的人工爆破资料,由莫霍界面的首波 P_n 的走时数据,经过松散层校正和高程校正后,采用改进的时间项法计算测点(台站和炮点)的时间项 t 和 V_(pn),最后引进弹性薄板模拟莫霍界面的形状,得出北京地区莫霍界面深度等值线图.从该图可以明显看出全区趋势变化:西北部山区莫霍界面埋藏深,东南平原莫霍界面埋藏浅,向北西72°方向,向下倾斜约2°,全区平均深度约37公里.此外,莫霍界面下的 V_(pn)较为稳定.
Based on the manual blasting data of Beijing Seismological Network, this paper uses the time-head method to calculate the measuring points (stations and shots) based on the travel time data of the first wave P_n of the Moho interface after the loose layer correction and elevation correction Term t and V_ (pn). Finally, the elastic sheet is introduced to simulate the shape of the Moho interface and the contour map of the Moho interface in Beijing is obtained. From the figure, it can be clearly seen that the trend of the whole area is changing: the Moho interface Buried deeply, the Moho interface in the southeast plain is buried shallow, inclined 72 ° to the north west and about 2 ° downward, and the average depth of the whole area is about 37 km. In addition, the V pn of the Moho interface is relatively stable.