Trapezoid-grid finite difference frequency domain method for seismic wave simulation
نویسندگان
چکیده
Abstract The large computational cost and memory requirement for the finite difference frequency domain (FDFD) method limit its applications in seismic wave simulation, especially models. For conventional FDFD methods, discretisation based on minimum model velocity leads to oversampling high-velocity regions. To reduce of method, we propose a trapezoid-grid scheme improve efficiency modeling. alleviate difficulty processing irregular grids, transform trapezoid grids Cartesian coordinate system square system. regular grid sizes correspond physical increasing with depth, which is consistent trend velocity. We derive Helmholtz equation corresponding absorbing boundary condition, then get stencil by combining central average-derivative (ADM). Dispersion analysis indicates that our can satisfy maximum phase error less than $1\%$ appropriate parameters. Numerical tests Marmousi show that, compared regular-grid ADM 9-point scheme, achieve about $80\%$ computation improvement reduction comparable accuracy.
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ژورنال
عنوان ژورنال: Journal of Geophysics and Engineering
سال: 2021
ISSN: ['1742-2140', '1742-2132']
DOI: https://doi.org/10.1093/jge/gxab038