【摘要】 瑞雷波的频散特性已在地震勘探及工程勘察等领域得到了大量应用,但目前存在一些问题亟待解决,例如当层状介质中存在低速层时,提取的频散曲线会发生"之"字形回折,利用传统的基阶模反演不能得到正确的结果.本文主要针对"之"字形频散曲线问题,提出f-k域能量最大模的概念,并成功地将最大模应用于频散曲线的f-k域提取及对地层结构的反演分析.通过反演模拟以及实测数据发现,最大模方法可以较好地解决基阶模反演所不能解决的"之"字形频散曲线反演问题.更多还原

【Abstract】 The dispersion of Rayleigh wave has a wide application in seismic exploration and engineering investigation,but there are still some problems not to be solved.For example,when low velocity layers exist in the medium,the dispersion curve obtained from seismogram is a ’zigzag’ curve,and the fundamental mode inversion method is not applicable to deal with it.To understand the ’zigzag’ dispersion curve appeared in the application,the max-mode(maximal amplitude in frequency-wavenumber domain) is defined and applied to the measure of dispersion curve and the inversion analysis of stratum.From the inversion simulation and measured data,it can be seen that the max-mode method can solve the problem of the inversion of ’zigzag’ dispersion curves effectively.更多还原