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Imaging the P-Wave Velocity Structure of Arctic Subsea Permafrost Using Laplace-Domain Full-Waveform Inversion

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Title
Imaging the P-Wave Velocity Structure of Arctic Subsea Permafrost Using Laplace-Domain Full-Waveform Inversion
Other Titles
라플라스 영역 파형역산을 이용한 북극해 해저영구동토층의 속도구조 영상화
Authors
Kang, Seung-Goo
Jin, Young Keun
Jang, Ugeun
Duchesne, Mathieu J.
Shin, Changsoo
Kim, Sookwan
Riedel, Michael
Dallimore, Scott R.
Paull, Charles K.
Choi, Yeonjin
Hong, Jong Kuk
Subject
Geology
Keywords
continental shelf of the Canadian Beaufort Sea; laplace domain full; waveform inversion; lower boundaries of permafrost; spatial distribution; subsea permafrost
Issue Date
2021-03
Citation
Kang, Seung-Goo, et al. 2021. "Imaging the P­Wave Velocity Structure of Arctic Subsea Permafrost Using Laplace­Domain Full­Waveform Inversion". JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 126(3): 1-15.
Abstract
Climate change in the Arctic has recently become a major scientific issue, and detailed information on the degradation of subsea permafrost on continental shelves in the Arctic is critical for understanding the major cause and effects of global warming, especially the release of greenhouse gases. The subsea permafrost at shallow depths beneath the Arctic continental shelves has significantly higher P-wave velocities than the surrounding sediments. The distribution of subsea permafrost on Arctic continental shelves has been studied since the 1970s using seismic refraction methods. With seismic refraction data, the seismic velocity and the depth of the upper boundary of subsea permafrost can be determined. However, it is difficult to identify the lower boundary and the internal shape of permafrost. Here, we present two-dimensional P-wave velocity models of the continental shelf in the Beaufort Sea by applying the Laplace-domain full-waveform inversion method to acquired multichannel seismic reflection data. With the inverted P-wave velocity model, we identify anomalous high seismic velocities that originated from the subsea permafrost. Information on the two-dimensional distribution of subsea permafrost on the Arctic continental shelf area, including the upper and lower bounds of subsea permafrost,are presented. Also, the two-dimensional P-wave velocity model allows us to estimate the thawing pattern and subsea permafrost distributions. Our proposed P-wave velocity models were verified by comparison with the previous distribution map of subsea permafrost from seismic refraction analyses, geothermal modeling, and well-log data.
URI
https://repository.kopri.re.kr/handle/201206/11778
DOI
http://dx.doi.org/10.1029/2020JF005941
Appears in Collections  
2020-2020, Investigation of submarine resource environment and seabed methane release in the Arctic (20-20) / Jin, Young Keun (PM20050)
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