摘要
地震波场正演模拟被广泛应用在地震波场特征分析中,常采用离散网格节点逼近连续介质的有限差分计算方法,计算中若采用粗网格将会产生严重的频散现象,但网格剖分较细则会大大增加所需内存和计算时间,降低计算效率。为消除频散影响,采用高阶交错网格有限差分计算方法,利用通量校正传输技术(FCT)对数值频散进行有效压制,较好的保存了真实波场,提高了波场快照质量。
Seismic wave field forward modeling was widely used in seismic wave field feature analysis.Discrete grid nodes were often used to approach the finite difference calculation method of continuous medium.In the calculation,if rough grid was adopted,serious frequency dispersion would occur.In order to eliminate the influence of frequency dispersion,the high-order staggered grid finite difference calculation method was adopted and the flux correction transmission technology(FCT)was used to effectively suppress the numerical frequency dispersion.The true wave field was well preserved and the quality of the wave field snapshot was greatly improved.
作者
刘卫刚
谭超先
周作黎
Liu Weigang;Tan Chaoxian;Zhou Zuoli(School of Geoscience and Surveying Engineering,China University of Mining and Technology (Beijing),Beijing 100083,China)
出处
《煤炭与化工》
CAS
2019年第1期81-84,共4页
Coal and Chemical Industry
关键词
有限差分
交错网格
数值频散
通量校正传输技术
finite difference
staggered grids
numerical dispersion
flux correction transmission technology
