ACOUSTIC-ELASTIC COUPLED FULL-WAVEFORM INVERSION IN THE LAPLACE DOMAIN WITH SCALED GRADIENT FOR IMPROVED DENSITY RECOVERY SCIE SCOPUS

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Title
ACOUSTIC-ELASTIC COUPLED FULL-WAVEFORM INVERSION IN THE LAPLACE DOMAIN WITH SCALED GRADIENT FOR IMPROVED DENSITY RECOVERY
Author(s)
Kang, Seung-Goo; Jang, Ugeun; Kim, Han-Joon; Jou, Hyeong-Tae; Shin, Changsoo; Hong, Jong Kuk; Jin, Young Keun
KIOST Author(s)
Jou, Hyeong Tae(주형태)
Publication Year
2018-10
Abstract
Acoustic-clastic coupled full-waveform inversion in the Laplace domain is well suited for recovering P- and S-wave velocity (V-p and V-s, respectively), and density from marine seismic data because it can simulate waves that are generated in the fluid (sea water) and propagate into the solid (seafloor). However, density is not recovered as reliably as V-p and V-s. In this study, we show that the density recovery procedure using full-waveform inversion for acoustic-elastic coupled media can be improved by scaling the gradient for the steepest descent operation. Gradient scaling is a heuristic approach that multiplies the gradient by the square of the gradient summed in the depth direction. We found that this scaling scheme resulted in more accurate density as well as attenuated numerical artefacts. To validate the scaling scheme, we illustrate both synthetic and real data examples.
ISSN
0963-0651
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/830
Bibliographic Citation
JOURNAL OF SEISMIC EXPLORATION, v.27, no.5, pp.487 - 504, 2018
Publisher
GEOPHYSICAL PRESS
Subject
FIELD
Keywords
Laplace domain; full-waveform inversion; density; gradient scaling; acoustic-elastic coupled wave equation
Type
Article
Language
English
Document Type
Article
Publisher
GEOPHYSICAL PRESS
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