垂直低速带中瑞雷面波传播特性研究  

STUDY ON PROPAGATION CHARACTERISTICS OF RAYLEIGH WAVE IN VERTICAL LOW-VELOCITY ZONE

作　　者：张大洲[1] 杨东锣[1] 熊章强[1] 潘丽峰[2] 

机构地区：[1]中南大学地球科学与信息物理工程学院,湖南长沙410083 [2]湖南涉外经济学院电气与信息工程学院,湖南长沙410205

出　　处：《物探化探计算技术》2013年第3期253-257,247,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(41004047);中南大学自由探索计划(201012200189)

摘　　要：为了研究瑞雷面波在通过横向不均匀介质时的传播特性,这里通过利用交错网格高阶有限差分法,对不同宽度及不同埋深的垂直低速带模型进行了瑞雷面波波场正演模拟。模拟结果表明:瑞雷面波遇到横向不均匀介质时会产生反射和透射,从波场记录可确定低速带的位置和宽度;低速带的埋深直接影响是否能产生高阶模式的面波,当出露地表的低速带宽度增加时,高阶模式面波能量逐渐增强。In order to study propagation characteristics of the Rayleigh wave in transverse non-homogeneous media,the vertical low-velocity zone models with different width and depth were simulated by Rayleigh wave filed forward modeling according to the staggered grid high-order finite difference method.The numerical results show that surface wave can produce reflection and transmission when it meet transverse non-homogeneous media,and then the location and the width of the low-velocity zone can be determined from the wave field recording;the depth of vertical low-velocity zone will directly affect whether to produce high order surface wave,with the increase of the width of the exposed surface of the vertical low-velocity zone,The energy of high order surface wave is gradually strengthened.

关 键 词：瑞雷面波 垂直低速带 高阶有限差分 正演模拟 频散曲线 

分 类 号：P631[天文地球—地质矿产勘探]