面波多模频散曲线的敏感性及特征分析

ANALYSIS OF SENSITIVITY AND CHARACTERISTICS OF MULTI-MODE DISPERSION CURVES OF SURFACE WAVE

面波勘探现在已经被广泛应用于工程选址及地震安全评价等方面,但其大多是针对Rayleigh波的应用,对Love波的关注较少。针对面波信息中的两种主要成份Rayleigh波和Love波对速度递增模型和存在低速层模型进行多模频散曲线的敏感性和特征分析,得到了多模式波对半空间介质模型和多层介质的响应特征,而且还对其基模式波和高模式波在高频和低频上的速度趋势进行了分析,细化了高频时的多模式波的理论最低速,得出了一些具有普遍性的结论,并为面波信息的综合利用提供了有力支持。

At present,surface wave exploration has been widely applied to the selection of site,the seismic safety evaluation,etc.More attention is paid to for the Rayleigh wave applications,but less attention is paid to the Love wave.The research in paper shows the analysis of sensitivity and characteristics of multi-mode dispersion wave of surface wave for the rate model and the low-velocity model,and achieved the media response of multi-mode wave in half-space models.The characteristics of base mode and higher mode in high frequency and low frequency were analyzed,and that refined the high frequency of multi-mode wave theory the lowest speed.Some general conclusions of surface wave supporting the surface wave are achieved.