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Open AccessArticle

Optimized Refraction Travel Time Tomography

by Sixin Liu 1,2, Zhuo Jia 1,2,*, Yinuo Zhu 1,2,*, Xueran Zhao 1,2 and Siyuan Cheng 1,2
1
College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China
2
Ministry of Land and Resources Key Laboratory of Applied Geophysics, Jilin University, Changchun 130026, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5439; https://doi.org/10.3390/app9245439
Received: 27 November 2019 / Accepted: 6 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Seismic Tomography)
In seismic refraction exploration, travel time tomography is the most widely used method in engineering and environmental geophysical exploration. In this paper, we mainly optimize the travel time tomography of refraction. First, with respect to the forward algorithm, we introduce a new travel time calculation method to improve the accuracy and efficiency of forward calculation. Based on the fast marching method (FMM), we introduce an improved forward calculation method called the multi-stencil fast marching method (MSFM). In the process of inversion, we propose a dynamic prior model composite constraint (DPMCC) method based on the T0 difference method from the idea of multi-scale inversion. Meanwhile, we use the prior information to improve the accuracy of inversion. Furthermore, we use the dynamic regularization factor selection method to make the inversion solution more stable and reliable. Finally, we test and analyze the synthetic data and the measured data to verify the effectiveness of the optimized travel time tomography algorithm. View Full-Text
Keywords: refraction travel time tomography; T0 differential method; MSFM (multi-stencil fast marching method); DPMCC (dynamic prior model composite constraint); dynamic regularization factor refraction travel time tomography; T0 differential method; MSFM (multi-stencil fast marching method); DPMCC (dynamic prior model composite constraint); dynamic regularization factor
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Liu, S.; Jia, Z.; Zhu, Y.; Zhao, X.; Cheng, S. Optimized Refraction Travel Time Tomography. Appl. Sci. 2019, 9, 5439.

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