Earthquake-Spawning Faults in the Seoul Metropolitan Area and Their Seismic Implications

Tae Kyung Hong, Dongchan Chung, Junhyung Lee, Seongjun Park, Byeongwoo Kim, Woohan Kim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Quaternary faults run across the Seoul metropolitan area that is the highest population region in the Korean Peninsula. Active fault identification and seismic hazard potential assessment are crucial for public safety. Densely deployed permanent and temporal seismic stations enabled us to detect micro to small earthquakes, allowing us to identify earthquake-spawning faults in Seoul metropolitan area. The source parameters of 455 earthquakes in 2004–2020 are refined. The Gutenberg-Richter b value is 0.94. Dominant focal depths are 4–15 km. The focal mechanism solutions of 64 earthquakes are determined using seismic-wave polarities and amplitude ratios. Strike-slip earthquakes are dominant in the region. Earthquakes are clustered around the Chugaryeong fault system. The dominant strikes of fault planes range from N20°E to N45°E in the northern and southern Seoul metropolitan areas, suggesting branch fault development locally. The earthquakes in middle-northern Seoul present N-S directional strike-slip motions at depths ∼7.5 km along the Chugaryeong fault, suggesting seismically active near-vertical faults subparallel with Chugaryeong fault.

Original languageEnglish
Article numbere2021EA001662
JournalEarth and Space Science
Volume8
Issue number7
DOIs
Publication statusPublished - 2021 Jul

Bibliographical note

Publisher Copyright:
© 2021. The Authors. Earth and Space Science published by Wiley Periodicals LLC on behalf of American Geophysical Union.

All Science Journal Classification (ASJC) codes

  • Environmental Science (miscellaneous)
  • General Earth and Planetary Sciences

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