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| | Abstract | | In this article, a global sweeping method (GSM) for computing the numerical solution of seismic travel time on a rectangular grid-cell model is described. The GSM calculates the travel-time at grids and defines velocity in cells. And the GSM applies an iterative computation, which uses a modified hybrid upwind difference for discretization of a local eikonal equation solver, and a novel sweeping scheme based on the boundary (source point) location. A local eikonal equation solver calculates a travel-time at any one (1) grid from travel-times at other three (3) grids. These grids belong in the same cell. An eikonal equation, which is applied to seismic travel-time computation, uses only one boundary, therefore the GSM can apply an effective sweeping scheme based on the boundary to global travel-time computation systematically. The GMS results the travel-time consistent with acoustic wave propagation simulation. |
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