High-precision Joint 2D Traveltime Calculation for Seismic Processing

Earth Sciences Research Journal

Mingchen Liu¹  Zhihou Zhang²  Fanchang Meng³  Hui Sun⁴  Cheng Gao⁵ 

[1] College for Geoexploration Science Technology, Jilin University, Changchun, 130026, China;Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China;Institute of Geology and Geophysics, the Chinese Academy of Sciences, Beijing, 100029, China;MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, 610031, China;School of Mines, Inner Mongolia University of Technology, Huhhot, 010051, China;

关键词: Seismic Imaging;    Traveltime calculation;    Fast Marching Method;    Wavefront Construction;    Seismic Processing;   

DOI  :  10.15446/esrj.v22n4.77362

来源: DOAJ

【 摘 要 】

Fast Marching Method (FMM) boasts high calculation efficiency and strong adaptability and stability while being applied to seismic traveltime. However, when it is applied to the largescale model, the calculation precision of FMM is insufficient. FMM has poor calculation precision near the source, which is an essential reason for the low accuracy of the whole algorithm. This paper puts forward a joint traveltime calculation method to address the problem. Wavefront Construction (WFC) with a relatively high calculation accuracy rather than FMM is adopted for calculation of the grid nodes’ traveltime near the source. After that, FMM is used to calculate the seismic traveltime in the remaining area. Joint traveltime calculation method greatly improves the calculation accuracy of the source’s surrounding area and the calculation accuracy of FMM. According to the new method, FMM is still adopted for the calculation of most grid nodes in the model, so the high calculation efficiency of FMM is maintained. Multiple numerical models are utilized to verify the above conclusions in the paper.

【 授权许可】

Unknown