层状介质中的瑞雷面波理论及其在场地脉动观测中的应用

本文介绍半无限空间上多层介质中瑞雷面波频散计算的哈斯克尔方法和诺波夫改进法。在讨论了瑞雷面小地表处水平和竖向分量幅值比（Ｈ／Ｖ）的计算方法后，本文通过引入复波速概念以考虑介质的阻尼。通过对上海市场地土层的计算分析，研究了影响频散曲线和Ｈ／Ｖ曲线的诸因素。艇Ｈ／Ｖ方法计算了上海市１２个有土层波速剖面的场地卓越周期并与实测结果对比发现两者符合良好，表明可利用瑞雷面波理论解释地脉动的观测结果。同时还确认

THEORY OF RAYLEIGH WAVE IN MULTI-LAYERED MEDIA AND ITS APPLICATION IN MICROSEISM OBSERVATION

In this paper, the theory of the Rayleigh surface wave in multi-layered media has been introduced. The matrix method for dispersion calculation by using Haskell and Knopoff techniques has been investigated. The authors reviewed the horizontal-to-vertical spectral ratios (H/V) technique and introduced complex wave velocity to consider the media damping. By using these mehods, some numerical example has been shown to investigate the factors, which effect dispersion and H/V curves. A comparison of the predominant periods of the calculating and the observation results showes that the a-greement is very well. The relationship of the predominant period and the bedrock' s depth has good conformability.