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• W1856306571 endingPage "1381" @default.
• W1856306571 startingPage "1359" @default.
• W1856306571 abstract "To simulate seismic wave propagation in the spherical Earth, the Earth′s curvature has to be taken into account. This can be done by solving the seismic wave equation in spherical coordinates by numerical methods. In this paper, we use an optimized, collocated-grid finite-difference scheme to solve the anisotropic velocity-stress equation in spherical coordinates. To increase the efficiency of the finite-difference algorithm, we use a non-uniform grid to discretize the computational domain. The grid varies continuously with smaller spacing in low velocity layers and thin layer regions and with larger spacing otherwise. We use stress-image setting to implement the free surface boundary condition on the stress components. To implement the free surface boundary condition on the velocity components, we use a compact scheme near the surface. If strong velocity gradient exists near the surface, a lower-order scheme is used to calculate velocity difference to stabilize the calculation. The computational domain is surrounded by complex-frequency shifted perfectly matched layers implemented through auxiliary differential equations (ADE CFS-PML) in a local Cartesian coordinate. We compare the simulation results with the results from the normal mode method in the isotropic and anisotropic models and verify the accuracy of the finite-difference method." @default.
• W1856306571 created "2016-06-24" @default.
• W1856306571 creator A5014215034 @default.
• W1856306571 creator A5019140146 @default.
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• W1856306571 date "2012-01-25" @default.
• W1856306571 modified "2023-10-09" @default.
• W1856306571 title "Three-dimensional anisotropic seismic wave modelling in spherical coordinates by a collocated-grid finite-difference method" @default.
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• W1856306571 doi "https://doi.org/10.1111/j.1365-246x.2011.05331.x" @default.
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