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使用多次复盖技术后,由于信噪比提高,在时间剖面上常可看到清楚的绕射波。如果说,以前绕射波只在少数特殊情况下才出现,那末,现在已成为经常可以利用的一种资料了。多次复盖为利用绕射波研究地质现象提供了实际的可能性。多次复盖使绕射波加强的原因,在本刊1972年第6期上已有文章作过精辟的分析。实际资料说明这些分析是正确的。但也有另外一些现象值得注意。有些速度谱上,除了正常反射波的速度外,还出现
With multiple overlay techniques, a clear diffraction wave can often be seen on the time profile due to the improved signal-to-noise ratio. If, in the past, diffraction was only present in a few special cases, it has now become a frequently available source. Multiple cover provides the practical possibility of using diffraction waves to study geological phenomena. Repeatedly cover the cause of the diffraction wave to strengthen, in the article on the 6th of 1972, there have been articles made incisive analysis. The actual data shows that these analyzes are correct. But there are other phenomena worth noting. Some speed spectra, in addition to the normal reflection wave speed, but also appeared