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Type: Journal article
Title: Fast and accurate global multiphase arrival tracking: the irregular shortest-path method in a 3-D spherical earth model
Author: Huang, G.-J.
Bai, C.-Y.
Greenhalgh, S.
Citation: Geophysical Journal International, 2013; 194(3):1878-1892
Publisher: Oxford University Press
Issue Date: 2013
ISSN: 0956-540X
Statement of
Guo-Jiao Huang, Chao-Ying Bai and Stewart Greenhalgh
Abstract: The traditional grid/cell-based wavefront expansion algorithms, such as the shortest path algorithm, can only find the first arrivals or multiply reflected (or mode converted) waves transmitted from subsurface interfaces, but cannot calculate the other later reflections/conversions having a minimax time path. In order to overcome the above limitations, we introduce the concept of a stationary minimax time path of Fermat's Principle into the multistage irregular shortest path method. Here we extend it from Cartesian coordinates for a flat earth model to global ray tracing of multiple phases in a 3-D complex spherical earth model. The ray tracing results for 49 different kinds of crustal, mantle and core phases show that the maximum absolute traveltime error is less than 0.12 s and the average absolute traveltime error is within 0.09 s when compared with the AK135 theoretical traveltime tables for a 1-D reference model. Numerical tests in terms of computational accuracy and CPU time consumption indicate that the new scheme is an accurate, efficient and a practical way to perform 3-D multiphase arrival tracking in regional or global traveltime tomography.
Keywords: Seismic tomography; Computational seismology; Wave propagation
Rights: © The Authors 2013
DOI: 10.1093/gji/ggt204
Appears in Collections:Aurora harvest 7
Geology & Geophysics publications

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