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本文利用江西永平爆破北西测线深地震测深资料,综合分析了其走时、振幅及频率特性,得到江西东北部地壳结构。利用振幅特性来减少反演的非唯一性。关于振幅特性分析,第一步用经典射线理论分析这一地区的振幅响应趋势;第二步用波动理论方法严格计算临界点附近的振幅特性,进一步研究经典射线理论方法的应用可能。最后还利用隧道波理论分析了永平爆破资料,得出这一地区的地壳上部可能存在低速层;地壳深部可能存在高速薄层,厚度在1km以内,速度为7.40km/s左右;莫霍面顶部为一梯度层结构。结果表明,既使在较稳定的地台区,地壳内部的结构也可能是相当复杂的。
In this paper, deep seismic sounding data of northwest line of blasting in Yongping, Jiangxi Province are used to analyze the characteristics of travel time, amplitude and frequency, and the crustal structure of northeastern Jiangxi Province is obtained. Use Amplitude Characteristics to Reduce Non-uniqueness of Inversion. As for the analysis of amplitude characteristics, the first step analyzes the trend of amplitude response in this region by classical ray theory. The second step uses the wave theory to strictly calculate the amplitude characteristics near the critical point and further studies the potential application of classical ray theory. Finally, the tunneling wave theory is used to analyze the data of Yongping blasting. It is concluded that there may be a low velocity layer in the upper crust in this area. There may be a high velocity thin layer in the deep crust with a thickness of 1km and a velocity of about 7.40km / s. The top is a gradient layer structure. The results show that the structure inside the crust can be quite complex even in relatively stable terraces.