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Characteristics of Large-Scale Fault Zone and Quaternary Fault Movement in Maegok-dong, Ulsan
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  • Journal title : The Journal of Engineering Geology
  • Volume 25, Issue 4,  2015, pp.485-498
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2015.4.485
 Title & Authors
Characteristics of Large-Scale Fault Zone and Quaternary Fault Movement in Maegok-dong, Ulsan
Cho, Jin-Hyuck; Kim, Young-Seog; Gwon, Sehyeon; Edwards, Paul; Rezaei, Sowreh; Kim, Taehyung; Lim, Soon-Bok;
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 Abstract
Structural analysis for a large-scale fault in Maegok-dong, Ulsan, was carried out based on filed-works to investigate the geometric and kinematic characteristics of the fault as well as its Quaternary slip. As results, a series of repeated stratigraphy, minor faults, fracture zones, and deformation band clusters are observed over a distance of about 100 m in the first studied site consisting of sedimentary rocks, which may indicate the damage zone of a large-scale fault in this site. In the second site, mainly composed of granitic clastic rocks, a large-scale thrust fault is expected based on low-angle dipping faults showing branched and/or merged patterns. Age of the last slip on this fault was restrained as after 33,275 ± 355 yr BP based on radiocarbon dating for organic material included in the gouge zone. Dimension of fault damage zone, dominant sense of slip, and age of the slip event associated with the fault suggest that these structures have a close relationship with the Ulsan Fault and/or Yeonil Tectonic Line, which are well-known large-scale neotectonic structural features around the study area. Therefore, it is necessary to study the characteristics of the faults in detail based on structural geology and paleoseismology in order to ensure seismic and geologic stability of the buildings under construction, and to prevent geologic hazards in this area.
 Keywords
fault zone;Quaternary fault movement;radiocarbon dating;Ulsan Fault;Yeonil Tectonic Line;
 Language
Korean
 Cited by
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Determination of representative elementary volume of fault core materials by particle distribution analysis, Geosciences Journal, 2018, 22, 1, 105  crossref(new windwow)
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Recent progress in studies on the characteristics of surface rupture associated with large earthquakes, Journal of the Geological Society of Korea, 2017, 53, 1, 129  crossref(new windwow)
4.
Classification of geological and engineering properties in weak rock: a case study of a tunnel in a fault zone in southeastern Korea, Bulletin of Engineering Geology and the Environment, 2017  crossref(new windwow)
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