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A numerical study on finding an optimum model in velocity tomography by using the extended information criterion
Author(s) -
Nishizawa O.,
Lei Xinglin
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl01092
Subject(s) - ray tracing (physics) , wavefront , travel time , tracing , algorithm , tomography , mathematics , iterative method , computer science , mathematical optimization , physics , optics , transport engineering , engineering , operating system
We performed numerical experiments to show that Extended Information Criterion (EIC) can be utilized for determining an optimum model in velocity reconstruction problems, in which a wavefront tracing method was employed for finding the minimum travel time raypath. First, travel times were calculated from a specified velocity model, and simulated data were produced by adding random error to the travel times. Velocity models were then reconstructed from the simulated data by employing a Simultaneous Iterative Reconstruction Technique (SIRT) starting from different initial models. Finally, EIC values were calculated for each reconstructed velocity model at every iteration, and were used for selecting an optimum velocity model. Results indicated that EIC provides an objective method for selecting an optimum solution from a suite reconstructions obtained from different initial models.