As can be seen in the figure, in the YZ profile where the source point was located, the absolute error of travel time calculated by 3D_FMM was large in the diagonal direction and displayed an increasing trend, with a max . err . of 0.396 ms.
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Microseismic P-Wave Travel Time Computation and 3D Localization Based on a 3D High-Order Fast Marching Method.
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