三层层状介质中瑞利波的频散曲线特征  

DISPERSION CURVES OF RAYLEIGH WAVE IN THREE-LAYER MEDIA

作　　者：杨天春[1] 何继善[1] 吕绍林[1] 王齐仁[1] 姚成华[1] 

机构地区：[1]中南大学地球物理勘察新技术研究所,湖南长沙410083

出　　处：《物探与化探》2004年第1期41-45,共5页Geophysical and Geochemical Exploration

摘　　要：在前人工作的基础上对三层层状介质的瑞利波频散曲线进行了正演模拟研究,对假定的几组典型模型参数的频散曲线进行了认真分析。通过分析可知,各频散曲线之间是互不相交的,从而对此问题有了一个更清晰的认识。指出当低速软弱夹层存在时频散曲线的特点,并根据分析结果,说明"之"字形频散曲线的形成机理。The authors carried out forward modeling on dispersion curves of Rayleigh wave in three-layer media and then analyzed characteristics of dispersion curves. It is proved that the dispersion curves never intersect with each other, thus correcting the false opinions held by some scholars. When a low-velocity layer exists, the fundamental guided curve will become complex, some guided waves will assume intersection trend, and some guided waves show phenomenon of truncation in certain conditions. According to the analyzing results, the forming mechanism of the zigzag dispersion curves has also been explained.

关 键 词：层状介质 瑞利波 正演模拟 “之”字形频散曲线 导波 

分 类 号：P631.4[天文地球—地质矿产勘探]