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A Field Application of 3D Seismic Traveltime Tomography (I) - Constitution of 3D Seismic Traveltime Tomography Algorithm -  

Moon, Yoon-Sup ((주) 지오맥스 기술연구소 지반공학부)
Ha, Hee-Sang ((주) 지오맥스)
Ko, Kwang-Buem ((주) 지오맥스 기술연구소)
Kim, Ji-Soo (충북대학교 자연과학대학 지구환경과학과)
Publication Information
Tunnel and Underground Space / v.18, no.3, 2008 , pp. 202-213 More about this Journal
Abstract
In this study, theoretical approach of 3D seismic traveltime tomography was investigated. To guarantee the successful field application of 3D tomography, appropriate control of problem associated with blind zone is pre-requisite. To overcome the velocity distortion of the reconstructed tomogram due to insufficient source-receiver array coverage, the algorithm of 3D seismic traveltime tomography based on the Fresnel volume was developed as a technique of ray-path broadening. For the successful reconstruction of velocity cube, 3D traveltime algorithm was explored and employed on the basis of 2nd order Fast Marching Method(FMM), resulting in improvement of precision and accuracy. To prove the validity and field application of this algorithm, two numerical experiments were performed for globular and layered models. The algorithm was also found to be successfully applicable to field data.
Keywords
3D seismic tomography; blind zone; source-receiver coverage; Fresnel volume; Fast Marching Method(FMM);
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