Efficient calculation method of the derivative of traveltime and amplitude using sweet algorithm for refraction tomography

Yun Seok Choi*, Changsoo Shin, Eunnyeong Heo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Inversion of traveltime requires an efficient algorithm for computing the traveltime as well as its Fréchet derivative. We compute the traveltime of the head waves using the damped wave solution in the Laplace domain, and then present a new algorithm for calculating the Fréchet derivative of the head wave traveltimes and amplitudes by exploiting the numerical structure of the finite element method, the modern sparse matrix technology, and SWEET algorithm developed recently. Next, we use a properly regularized steepest descent method to invert the traveltime of the Marmousi-2 model. Through our numerical tests, we will demonstrate that refraction tomography with large aperture data can be used to construct the initial velocity model for the pre-stack depth migration.

Original languageEnglish (US)
Pages (from-to)327-341
Number of pages15
JournalJournal of Seismic Exploration
Volume12
Issue number4
StatePublished - May 1 2004

Keywords

  • Fréchet derivative
  • Inversion
  • Pre-stack depth migration
  • Refraction tomography
  • SWEET algorithm
  • Traveltime
  • Velocity model

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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