1887
Volume 50, Issue 2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

ABSTRACT

This paper presents a first-arrival tomography incorporating a fast sweeping method (FSM) solving the factored eikonal equation (factored FSM). The traveltime calculation method plays a significant role in velocity inversion. However, for a point source condition, all finite-difference based eikonal solvers suffer from the source singularity problem. Numerical error caused by source singularity will propagate from the source to all computational domains, and makes traveltimes inaccurate. A FSM solving the factored eikonal equation can deal with the source singularity problem very well. Therefore, a first-arrival tomography is developed by incorporating 2D and 3D factored FSMs to provide more accurate traveltimes in velocity inversion. For comparison, an open source package is used to invert the same data set. It incorporates the traveltime calculation algorithms and . Traveltime accuracy tests show that factored FSM can generate more accurate traveltimes than FSM, and . Numerical and field data tests show that inversion with factored FSM can acquire much better tomograms than inversion with and . Therefore, it is worthwhile using a more accurate traveltime computation method in velocity inversion.

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2019-03-04
2026-01-17
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  • Article Type: Research Article
Keyword(s): factored eikonal equation; fast sweeping method; seismic tomography

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