Neotectonics at the SE Continental Margin of the Korean Peninsula: Implications for the Back-Arc Region Behind the SW Japan Arc SCIE SCOPUS

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Title
Neotectonics at the SE Continental Margin of the Korean Peninsula: Implications for the Back-Arc Region Behind the SW Japan Arc
Author(s)
Kim, Han Joon; Moon, Seonghoon; Kim, Chung Ho; Kim, Kwang-Hee; Seo, Wooseok; Cho, Kwang-Hyun; Moon, Hye Jin; Lee, Gwang Hoon
KIOST Author(s)
Moon, Seonghoon(문성훈)Kim, Chung Ho(김충호)Moon, Hye Jin(문혜진)
Alternative Author(s)
김한준; 문성훈; 김충호; 문혜진
Publication Year
2022
Abstract
The geological evolution of the SE continental margin of the Korean Peninsula resulted from crustal extension with back-arc rifting to spreading (from the Late Oligocene to the Middle Miocene) and crustal shortening with back-arc closing (from the Middle Miocene to the present), associated with the separation of the SW Japan Arc. Earthquakes occur more frequently in this region compared to other offshore regions of the Korean Peninsula; among them, the M-w 5.0 earthquake that occurred in 2016 is the largest event ever recorded instrumentally. We investigate the geological structure of the epicentral area of the M-w 5.0 earthquake and address neotectonic activity at the margin. Seismic reflection profiles reveal abundant faults in the epicentral area that make up strike-slip fault systems. A fault system encompassing the epicenter of the M-w 5.0 earthquake is suggested as the source structure, with its attitude consistent with the focal mechanism solution. We propose that the M-w 5.0 earthquake occurred due to the reactivation of an extensional fault created during back-arc rifting which currently induces dextral slip under the ENE-WSW-oriented compressional stress field in and around the Korean Peninsula. The maximum magnitude of earthquakes expected at the margin is estimated as no higher than M-w 6.0. Restoration of seismic profiles indicates that the current stress field was established after 5.5 Ma. The S-wave velocity structure of the uppermost mantle shows asthenospheric upwelling elongated along the continental margin, which may be considered an important regional source of the current stress field by inducing convection in the uppermost mantle toward the Korean Peninsula lithosphere.
ISSN
0033-4553
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/42401
DOI
10.1007/s00024-022-02979-0
Bibliographic Citation
PURE AND APPLIED GEOPHYSICS, 2022
Publisher
SPRINGER BASEL AG
Keywords
Continental margin of the Korean Peninsula; neotectonics; seismic profiles; fault mapping; cross-section restoration; stress field
Type
Article
Language
English
Document Type
Article; Early Access
Publisher
SPRINGER BASEL AG
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