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本文是对陕西长安、山西代县和太谷等地工业爆破的资料采用时间项法研究晋中南地壳结构的初步成果。文中首先结合长安爆破观测资料的总结,对时间项方法作一介绍。为使用太谷等缺乏起爆时刻的爆破资料,对时间项方法作了一些改进,使对于那些未有起爆时刻的爆破资料亦能用于确定时间项。使用上述爆破和各台记录的初动到时获得了晋中南地区的界面速度为7.95±0.04公里/秒,求得了41个点的时间项,取莫霍面以上介质的平均速度v_0=6.4公里/秒反演求得了各点的莫霍界面深度,并对所得的结果结合晋中南地区的地震活动性及部分地震震源机制结果进行了初步的分析和讨论。
This article is a preliminary study on the crustal structure of Jinzhongnan by using the time-entry method for the data of industrial blasting in Chang’an of Shaanxi Province, Dai County of Shanxi and Taigu. First of all, this paper combines the observation data of Chang’an blasting and summarizes the time item method. In order to use the information of blasting, such as Taigu, which lacked the initiation time, some improvements have been made to the time item method so that the information of the blasting which has not been detonated can also be used to determine the time item. Using the above blasting and initial recording of each record, the interface velocity of Jinzhongnan area was 7.95 ± 0.04 km / s, and the time item of 41 points was obtained. The average velocity of medium above Moho was v_0 = 6.4 km / S The depth of Moho interface at each point is obtained by inversion, and the results obtained are combined with the seismic activity of Jinzhongnan area and the results of focal mechanism of some earthquakes.