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Efficient seismic ray tracing based on the shortest path method
https://niedrepo.bosai.go.jp/records/4676
https://niedrepo.bosai.go.jp/records/46768e9ff26ec1ea44efa4727897d98df1df
Item type  researchmap(1)  

公開日  20230330  
タイトル  
言語  en  
タイトル  Efficient seismic ray tracing based on the shortest path method  
言語  
言語  eng  
著者 
Shoji Sekiguchi
× Shoji Sekiguchi


抄録  
内容記述タイプ  Other  
内容記述  <title>SUMMARY</title> Limiting the number of valid nodes around a reference ray can greatly reduce the calculation time of the shortestpath method (SPM). The calculation is executed by increasing the number of cells and/or nodes in the target area, step by step, until the rays converge. The ray obtained in the previous step is used as a reference ray, and the initial reference rays are given by the ordinary SPM. The Dijkstra algorithm and binary heap sorting method are used, as in the ordinary SPM. As the cell and node numbers increase, the calculation time for the modified SPM (mSPM) is reduced compared to that for the ordinary SPM. In the 3D (100?× 100?× 100 km3) checkerboard velocity pattern model, the relative calculation time becomes two to four orders of magnitude smaller. The calculation time for the mSPM itself is approximately proportional to E?log2(V), where E is the edge (ray path segment) number and V is the vertex (node) number, as seen in the heap sorting algorithm. The mean traveltime and ray path differences between the mSPM and pseudobending method (PBM) are small, less than 0.005?s and around 0.6?km, respectively, and slightly larger than those with respect to the ordinary SPM. The total differences from the exact solution are estimated to be less than 0.01?s and 1.0?km, which are sufficiently small for traveltime tomography. The traveltime and ray path can be improved by utilizing iterative calculations, shifting of the starting point and more neighbour nodes. The ray path obtained by the mSPM can be a local minimum, according to velocity models. The relative mean traveltime and ray path differences between adjacent cells and nodes generally show trends similar to those of the traveltime and ray path differences from the PBM. Hence, these relative differences can help reveal the behaviour of the differences from the PBM. 

言語  en  
書誌情報 
en : Geophysical Journal International 巻 225, 号 2, p. 729743, 発行日 202105 

出版者  
言語  en  
出版者  Oxford University Press (OUP)  
ISSN  
収録物識別子タイプ  EISSN  
収録物識別子  1365246X  
DOI  
関連識別子  10.1093/gji/ggab001 