Optimized finite-difference operator for broadband seismic wave modeling
作者单位：Chinese Academy of SciencesInstitute of Geology and Geophysics
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
基 金：supported by the National Natural Science Foundation of China(grant nos.40974028,41074092) the Natonal Major Project of China(grant no.2011ZX05008-006)
摘 要：High-resolution image and waveform inversion of smallscale targets requires the handling of high-frequency seismic ***,conventional finite-difference(FD) methods have strong numerical dispersions in the presence of high-frequency *** reduce these numerical dispersions,we optimized the constant coefficients of the FD operator by maximizing the wavenumber coverage within a given error *** set up three general criteria to enhance the convergence of the algorithm and reduce the optimization *** selected the error limitation to be 0.0001,this being the smallest in the literature,which led to perfect agreement between theoretical analyses and numerical *** accuracy of our optimized FD methods can even reach that of much higher order unoptimized FD methods,which means great savings of computational efforts and memory *** advantages become even more apparent with 3D modeling,especially for saving memory demand.