Deep Fault Plane Revealed by High-Precision Locations of Early Aftershocks Following the 12 September 2016 M-L 5.8 Gyeongju, Korea, Earthquake
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Title
- Deep Fault Plane Revealed by High-Precision Locations of Early Aftershocks Following the 12 September 2016 M-L 5.8 Gyeongju, Korea, Earthquake
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Author(s)
- Kim, Kwang-Hee; Kim, Jeongmu; Han, Minhui; Kang, Su Young; Son, Moon; Kang, Tae-Seob; Rhie, Junkee; Kim, YoungHee; Park, Yongcheol; Kim, Han-Joon; You, Qingyu; Hao, Tianyao
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Alternative Author(s)
- 김한준
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Publication Year
- 2018-02
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Abstract
- An M-L 5.8 earthquake, which is large for a stable continental region, occurred in southeastern Korea on 12 September 2016. Ten days of data from a temporary seismic network deployed immediately after the mainshock are combined with data from permanent seismic stations to determine high-precision locations of early aftershocks to reveal the geometry of the causative structure at depth. Well-constrained relative earthquake hypocenters and focal mechanisms are used to define the subsurface fault plane with a strike of similar to N28 degrees E and dip of similar to 78 degrees to the east-southeast. This fault plane extends from 12 to 15 km depth and may have been responsible for most of the early earthquakes in the Gyeongju earthquake sequence. A pre-existing weak zone in a strike-slip duplex that formed from subsidiary Riedel shears beneath the Yangsan fault system may have been reactivated to nucleate the mainshock and aftershocks.
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ISSN
- 0037-1106
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/1021
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DOI
- 10.1785/0120170104
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Bibliographic Citation
- BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, v.108, no.1, pp.517 - 523, 2018
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Publisher
- SEISMOLOGICAL SOC AMER
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Subject
- FOCAL MECHANISMS; SOUTH-KOREA; REACTIVATION; TECTONICS; PENINSULA; ODAESAN; ZONES
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Type
- Article
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Language
- English
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Document Type
- Article
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