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

doi:10.1029/2021EA001662

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 journal › Article › peer-review

4 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 language	English
Article number	e2021EA001662
Journal	Earth and Space Science
Volume	8
Issue number	7
DOIs	https://doi.org/10.1029/2021EA001662
Publication status	Published - 2021 Jul

Bibliographical note

Funding Information:
We are grateful to Dr. Andrea Donnellan (editor) and anonymous reviewer for valuable comments. The seismic records were collected from the Korean Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018-02910. Additionally, this research was partly supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF-2017R1A6A1A07015374, NRF-2018R1D1A1A09083446).

Funding Information:
We are grateful to Dr. Andrea Donnellan (editor) and anonymous reviewer for valuable comments. The seismic records were collected from the Korean Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018‐02910. Additionally, this research was partly supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF‐2017R1A6A1A07015374, NRF‐2018R1D1A1A09083446).

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)
Earth and Planetary Sciences(all)

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10.1029/2021EA001662

Cite this

@article{2072eb7e4e8d4e06bc55fd56cabe3e25,

title = "Earthquake-Spawning Faults in the Seoul Metropolitan Area and Their Seismic Implications",

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.",

author = "Hong, {Tae Kyung} and Dongchan Chung and Junhyung Lee and Seongjun Park and Byeongwoo Kim and Woohan Kim",

note = "Funding Information: We are grateful to Dr. Andrea Donnellan (editor) and anonymous reviewer for valuable comments. The seismic records were collected from the Korean Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018-02910. Additionally, this research was partly supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF-2017R1A6A1A07015374, NRF-2018R1D1A1A09083446). Funding Information: We are grateful to Dr. Andrea Donnellan (editor) and anonymous reviewer for valuable comments. The seismic records were collected from the Korean Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018‐02910. Additionally, this research was partly supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF‐2017R1A6A1A07015374, NRF‐2018R1D1A1A09083446). Publisher Copyright: {\textcopyright} 2021. The Authors. Earth and Space Science published by Wiley Periodicals LLC on behalf of American Geophysical Union.",

year = "2021",

month = jul,

doi = "10.1029/2021EA001662",

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AU - Hong, Tae Kyung

AU - Chung, Dongchan

AU - Lee, Junhyung

AU - Park, Seongjun

AU - Kim, Byeongwoo

AU - Kim, Woohan

N1 - Funding Information: We are grateful to Dr. Andrea Donnellan (editor) and anonymous reviewer for valuable comments. The seismic records were collected from the Korean Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018-02910. Additionally, this research was partly supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF-2017R1A6A1A07015374, NRF-2018R1D1A1A09083446). Funding Information: We are grateful to Dr. Andrea Donnellan (editor) and anonymous reviewer for valuable comments. The seismic records were collected from the Korean Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018‐02910. Additionally, this research was partly supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF‐2017R1A6A1A07015374, NRF‐2018R1D1A1A09083446). Publisher Copyright: © 2021. The Authors. Earth and Space Science published by Wiley Periodicals LLC on behalf of American Geophysical Union.

PY - 2021/7

Y1 - 2021/7

N2 - 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.

AB - 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.

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M1 - e2021EA001662

ER -

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

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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