摘要
当瑞雷波在层状介质半空间中传播时,可以证明除了瑞雷面波以外,会出现多个模式的导波,特别是在有低速的软弱夹层情况下。利用基于基模式瑞雷波理论,实际解释工作中常常会出现问题。论文针对这些问题,对含低速夹层的三层模型的瑞雷波相速度频散曲线进行了正演计算,描述了频散曲线特征与介质参数的关系,并对其特征进行了归纳,指出了在实际工作中需注意的问题。
Rayleigh surface wave is not the unique kind of wave mode while Raleigh waves propagate in a layered medium, especially in the case of interlayer existing. High mode Raleigh waves may occur in observed records. Rayleigh surface wave, in other word, foundational mode wave only give a part of the nature of the medium detected. Since most of the practical methods are based on the foundational mode, the determination of the structure and the nature of a low-velocity interlayer earth are prone to be mistaken or misunderstood. In this paper, authors analyze the characteristics of the dispersion curves derived from three kinds models with various parameters and discuss the resolution based on the foundational mode theory.
出处
《工程地球物理学报》
2005年第3期208-215,共8页
Chinese Journal of Engineering Geophysics
关键词
层状介质
瑞雷波
频散特征
低速层
无损检测
layered medium
Rayleigh wave
detection dispersion
low-velocity layer
nondestructive
