Imaging the crustal structure along the KCRT-2008 profile in the Southern Korean Peninsula using regularisation
Jihyun Choi 1 Sangmin Lee 1 Joongmoo Byun 1 4 Ki Young Kim 2 Jung Mo Lee 31 Department of Earth Resources and Environmental Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea.
2 Department of Geophysics, Kangwon National University, 1, Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea.
3 Department of Geology, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea.
4 Corresponding author. Email: jbyun@hanyang.ac.kr
Exploration Geophysics 49(4) 462-468 https://doi.org/10.1071/EG17081
Submitted: 13 June 2017 Accepted: 14 June 2017 Published: 10 August 2017
Abstract
Information regarding crustal structure is important for geological and geophysical research. Several attempts have been made to delineate the crustal structure of the Korean Peninsula, but the resolution in these studies has generally been too low. To acquire detailed images of the regional subsurface structure, we applied seismic data processing tools that are commonly used in oil exploration to crustal refraction data recorded along the Korea Crust Research Team 2008 (KCRT-2008) profile at irregular intervals. To use conventional seismic data processing tools, the data should be sampled regularly in both time and space domains. In this study, we applied the matching pursuit interpolation technique to regularise the KCRT-2008 data in the space domain, followed by dip filtering to attenuate coherent noise. Then, Kirchhoff prestack depth migration was applied using both refracted and reflected waves to image the subsurface structure at higher signal-to-noise ratios and increase spatial resolution using far offset data. The migrated section shows the interfaces of three mid-crustal layers at depths of 14.27 and 24.37–25.34 km and the downwarped Moho at a depth range of 29.3–36.1 km.
Key words: crustal structure, KCRT-2008, Korean Peninsula, Moho, regularisation.
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