Earthquake Source Mechanism and Rupture Directivity of the 12 September 2016 Mw 5.5 Gyeongju, South Korea, Earthquake
2017; Seismological Society of America; Volume: 107; Issue: 5 Linguagem: Inglês
10.1785/0120170004
ISSN1943-3573
AutoresYoung‐Hee Kim, Xiaohui He, Sidao Ni, Hobin Lim, Sun‐Cheon Park,
Tópico(s)Seismology and Earthquake Studies
ResumoBrief Report| September 25, 2017 Earthquake Source Mechanism and Rupture Directivity of the 12 September 2016 Mw 5.5 Gyeongju, South Korea, Earthquake YoungHee Kim; YoungHee Kim aSchool of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea, younghkim@snu.ac.kr, hbim7676@snu.ac.kr Search for other works by this author on: GSW Google Scholar XiaoHui He; XiaoHui He bSchool of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China, hexiaohu@mail.ustc.edu.cn Search for other works by this author on: GSW Google Scholar SiDao Ni; SiDao Ni cCAS State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Wuhan 430077, China, sdni@whigg.ac.cn Search for other works by this author on: GSW Google Scholar Hobin Lim; Hobin Lim aSchool of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea, younghkim@snu.ac.kr, hbim7676@snu.ac.kr Search for other works by this author on: GSW Google Scholar Sun‐Cheon Park Sun‐Cheon Park dKorea Meteorological Administration, Seoul 07062, Republic of Korea, suncheon@korea.kr Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2017) 107 (5): 2525–2531. https://doi.org/10.1785/0120170004 Article history first online: 27 Sep 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation YoungHee Kim, XiaoHui He, SiDao Ni, Hobin Lim, Sun‐Cheon Park; Earthquake Source Mechanism and Rupture Directivity of the 12 September 2016 Mw 5.5 Gyeongju, South Korea, Earthquake. Bulletin of the Seismological Society of America 2017;; 107 (5): 2525–2531. doi: https://doi.org/10.1785/0120170004 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Two earthquakes (Mw 5.1 and 5.5) ruptured branches of the Yangsan fault system in Gyeongju, South Korea, on 12 September 2016. Aftershocks, including a notable Mw 4.3 earthquake on 19 September 2016, were clustered around the epicenters of the first two events. The Mw 5.5 earthquake is considered the largest earthquake in South Korea to have occurred during the modern instrumental recording period since 1978. Although there is no apparent surface rupture, these earthquakes have greatly shaken South Korea, leaving both physical and societal impacts. In this study, we determine the source mechanism and rupture directivity using regional seismic‐waveform data to understand the earthquake source processes. Based on the waveform inversion, we report that the mainshock (Mw 5.5 event) is a strike‐slip event with two nodal planes 117°/84°/21° and 24°/69°/173° at a depth of 14 km. The inversion also demonstrates that the mainshock event ruptured against the 24° seismogenic fault plane to the south‐southwest, with a rupture length of ∼4.3 km. This rupture propagation direction agrees well with the spatial distribution of relocated aftershock events and reported seismic intensities. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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