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Traveltime calculations from frequency-domain downward-continuation algorithms

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Authors
Shin, Changsoo; Ko, Seungwon; Kim, Wonsik; Min, Dong-Joo; Yang, Dongwoo; Marfurt, Kurt J.; Shin, Sungryul; Yoon, Kwangjin; Yoon, Cheol Ho
Issue Date
2003
Publisher
Society of Exploration Geophysicists (SEG)
Citation
Geophysics, 68, 1380-1388
Abstract
We present a new, fast 3D traveltime calculation algorithm
that employs existing frequency-domain waveequation
downward-continuation software. By modifying
such software to solve for a few complex (rather than
real) frequencies, we are able to calculate not only the
first arrival and the approximately most energetic traveltimes
at each depth point but also their corresponding
amplitudes.We compute traveltimes by either taking
the logarithm of displacements obtained by the oneway
wave equation at a frequency or calculating derivatives
of displacements numerically. Amplitudes are estimated
from absolute value of the displacement at a
frequency.
By using the one-way downgoing wave equation, we
also circumvent generating traveltimes corresponding to
near-surface upcoming head waves not often needed in
migration.We compare the traveltimes computed by our
algorithm with those obtained by picking the most energetic
arrivals from finite-difference solutions of the
one-way wave equation, and show that our traveltime
calculation method yields traveltimes comparable to solutions
of the one-way wave equation. We illustrate the
accuracy of our traveltime algorithm by migrating the
2D IFP Marmousi and the 3D SEG/EAGE salt models.
ISSN
0016-8033
Language
English
URI
http://hdl.handle.net/10371/6121
DOI
https://doi.org/10.1190/1.1598131
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Journal Papers (저널논문_에너지시스템공학부)
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