The Quaternary slip rate of the Yangsan Fault offshore the SE Korean Peninsula and implications for seismic hazard assessment SCIE SCOPUS

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Title
The Quaternary slip rate of the Yangsan Fault offshore the SE Korean Peninsula and implications for seismic hazard assessment
Author(s)
Moon, Seonghoon; Kim, Han Joon; Kim, Chung Ho; Jun, Hyunggu; Lee, Sang Hoon; Jou, Hyeong Tae; Kim, Kwang-Hee
KIOST Author(s)
Moon, Seonghoon(문성훈)Kim, Chung Ho(김충호)Lee, Sang Hoon(이상훈)Jou, Hyeong Tae(주형태)
Alternative Author(s)
문성훈; 김한준; 김충호; 전형구; 이상훈; 주형태
Publication Year
2021-01
Abstract
The Yangsan Fault, a NNE-trending strike-slip fault, is a pronounced active structure in the Korean Peninsula which recently generated an earthquake with moment magnitude M-W 5.5 (M-L 5.8) that was the largest instrumentally recorded event in Korea. High-resolution seismic profiles obtained on a dense grid reveal deformation of Quaternary sequences that indicates the offshore extension of the Yangsan Fault to the SE continental shelf of the Korean Peninsula. The offshore fault system comprises a main strand and subsidiary Riedel shears formed by dextral slip. We estimated the Quaternary lateral slip rate of the Riedel shear zone using seismic profiles. The Quaternary slip rate of 0.73 +/- 0.07 mm/yr was estimated from the dextral displacement of the base boundary of the Quaternary sequences along the main strand. Modelling of fault activities based on empirical relations incorporating the slip rate indicates that (1) the offshore Riedel shear zone is capable of generating earthquakes with magnitude up to M-W 6.07-6.25 with recurrence intervals of 550-1500 years and (2) the individual Riedel shears can generate earthquakes with magnitude less than M-W 5.87.
ISSN
1947-5705
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/41369
DOI
10.1080/19475705.2021.1872718
Bibliographic Citation
GEOMATICS NATURAL HAZARDS & RISK, v.12, no.1, pp.310 - 327, 2021
Publisher
TAYLOR & FRANCIS LTD
Keywords
Yangsan Fault; seismic profiling; offshore fault structure; Quaternary slip rate; seismic hazards
Type
Article
Language
English
Document Type
Article
Publisher
TAYLOR & FRANCIS LTD
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