Surface Deformations and Rupture Processes Associated with the 2017 Mw 5.4 Pohang, Korea, Earthquake

Abstract

Research Article| February 12, 2019 Surface Deformations and Rupture Processes Associated with the 2017 Mw 5.4 Pohang, Korea, Earthquake Jin‐Hyuck Choi; Jin‐Hyuck Choi aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Kyoungtae Ko; Kyoungtae Ko aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Yong Sik Gihm; Yong Sik Gihm aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Chang Soo Cho; Chang Soo Cho aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Hoonyol Lee; Hoonyol Lee bDepartment of Geophysics, Kangwon National University, Chuncheon 24341, Republic of Korea, [e-mail] Search for other works by this author on: GSW Google Scholar Seok Goo Song; Seok Goo Song aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Eun‐Seok Bang; Eun‐Seok Bang cMineral Resources Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail] Search for other works by this author on: GSW Google Scholar Hong‐Jin Lee; Hong‐Jin Lee dGeoscience Platform Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Han‐Kyung Bae; Han‐Kyung Bae aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Sung Won Kim; Sung Won Kim aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Sung‐Ja Choi; Sung‐Ja Choi aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Sung Soon Lee; Sung Soon Lee dGeoscience Platform Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Seung Ryeol Lee Seung Ryeol Lee aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Search for other works by this author on: GSW Google Scholar Author and Article Information Jin‐Hyuck Choi aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Kyoungtae Ko aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Yong Sik Gihm aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Chang Soo Cho aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Hoonyol Lee bDepartment of Geophysics, Kangwon National University, Chuncheon 24341, Republic of Korea, [e-mail] Seok Goo Song aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Eun‐Seok Bang cMineral Resources Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail] Hong‐Jin Lee dGeoscience Platform Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail] Han‐Kyung Bae aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Sung Won Kim aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Sung‐Ja Choi aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Sung Soon Lee dGeoscience Platform Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail] Seung Ryeol Lee aGeology Division, Korea Institute for Geosciences and Mineral Resources, Daejeon 34132, Republic of Korea, [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail] Publisher: Seismological Society of America First Online: 12 Feb 2019 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2019) 109 (2): 756–769. https://doi.org/10.1785/0120180167 Article history First Online: 12 Feb 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jin‐Hyuck Choi, Kyoungtae Ko, Yong Sik Gihm, Chang Soo Cho, Hoonyol Lee, Seok Goo Song, Eun‐Seok Bang, Hong‐Jin Lee, Han‐Kyung Bae, Sung Won Kim, Sung‐Ja Choi, Sung Soon Lee, Seung Ryeol Lee; Surface Deformations and Rupture Processes Associated with the 2017 Mw 5.4 Pohang, Korea, Earthquake. Bulletin of the Seismological Society of America 2019;; 109 (2): 756–769. doi: https://doi.org/10.1785/0120180167 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 In November 2017, an Mw 5.4 earthquake with a shallow (⁠∼4 km⁠) hypocenter occurred in the Pohang area, one of the most developing industrial cities in South Korea. This shock resulted in the costliest earthquake damages in modern Korean history. Immediately after the event, it was not easy to recognize the source fault due to the lack of clear coseismic surface ruptures but also the absence of previously mapped active faults around the epicenter. Based on satellite‐ and unmanned aerial vehicle (UAV)‐derived images, with ground resolution higher than 0.5 m, and field observations, we investigate surface deformation such as sand blows and ground failures associated with the Pohang earthquake as well as bedrock fault exposures in the epicentral area. To better constrain the source fault and deformation mechanism, we combine both moment tensors with aftershock relocations and surface displacements estimated by Interferometric Synthetic Aperture Radar (InSAR). Our results indicate that (1) various types and distributions of secondary ground deformation were controlled by blind oblique‐slip rupture; characterized by right‐lateral and reverse‐slip components, on a reactivated pre‐existing segmented normal‐fault system, and (2) local ground conditions could trigger or amplify ground deformations and their related earthquake damage. Our study highlights the importance of mapping the extent of coseismic deformation as well as the trace of active faults on improving seismic hazard assessments in the Korean Peninsula. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.