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- Title
Single-iterative algorithm based on first arrival waves for the forward modeling of two-dimensional tomography.
- Authors
Lu, Jiangbo; Tang, Shenghua; Zhang, Guogang; Zheng, Hui; Lu, Lizhi
- Abstract
Two-dimensional tomographic forward modeling based on first arrivals requires the calculation of the minimum travel times of multiple emission points in a single iteration. The conventional method, which calculates each emission point one by one, produces many unuseful calculations and has low computational efficiency. To solve this problem, given the characteristic that the velocity distribution of a model does not change during a single iteration of forward modeling, an improved algorithm was proposed based on the reciprocity principle and Fermat's principle. The ray tracing results of a small number of emission points were used to constrain the calculation area of other emission points, which reduced the number of unuseful calculations and improved the calculation efficiency of a single-iteration tomographic forward modeling simulation. Theoretical analysis and numerical examples showed that for a homogeneous model, when the transmitting and receiving points were located on two long sides, three adjacent sides (i.e., two long sides and one short side), and four sides, the computational efficiency of the improved algorithm was about 2 times, 2 times, and 1.5 times, respectively, that of the conventional method. For heterogeneous models, the computational efficiency of the improved algorithm was usually more significant.
- Subjects
TWO-dimensional models; RECIPROCITY theorems; TOMOGRAPHY; ALGORITHMS; NUMERICAL analysis
- Publication
Acta Geophysica, 2024, Vol 72, Issue 3, p1601
- ISSN
1895-6572
- Publication type
Article
- DOI
10.1007/s11600-023-01156-8