二维弹性随机介质中的波场特征  

The wave field characteristics in 2-D elastic random media

作　　者：奚先[1,2] 姚姚[3] 

机构地区：[1]华中科技大学数学系 [2]中国地质大学(武汉)应用地球物理系,武汉430074 [3]中国地质大学(武汉)应用地球物理系

出　　处：《地球物理学进展》2005年第1期147-154,共8页Progress in Geophysics

摘　　要：通过波动方程的交错网格有限差分正演,模拟了地震波在二维弹性随机介质中的传播及其自激自收时间记录.本文将理论记录剖面分割成三个不同的时间区段,在三个时间区段上分别计算并提取剖面的统计特征.运用正交试验设计和分析方法,本文全面研究了混合型弹性随机介质的五个统计特征(自相关长度、粗糙度因子、扰动标准差、纵波背景速度、纵横波速度比)及其交互作用与各种波场特征之间的关联,并得出了若干结论.This paper, through the staggered-mesh finite difference simulations of the wave equations, simulated the propagation of the seismic wave and the relevant zero offset time record in the 2-D elastic random medium models. We divide up the theoretic recording sections into three different time sectors, separately calculated and extracted the statistical characteristics of the sections in the different time sectors. Exercised the Orthogonal Experimental Design and analyses technique, of the five statistic characteristics of the intermixed random media model (autocorrelation length, roughness factor, standard deviation of fluctuation, longitudinal wave's background velocity, and longitudinal transverse wave's velocity ratio) and their corresponding interactions, we allsidedly researched their relationships with each different wave field characteristic, and gained several conclusions.

关 键 词：随机介质模型 弹性波场模拟 波场特征 正交试验设计 

分 类 号：P315[天文地球—地震学]