Strong Ground Motion and Pulse‐Like Velocity Observations in the Near‐Fault Region of the 2018 Mw 6.4 Hualien, Taiwan, Earthquake

Abstract

Research Article| September 26, 2018 Strong Ground Motion and Pulse‐Like Velocity Observations in the Near‐Fault Region of the 2018 Mw 6.4 Hualien, Taiwan, Earthquake Chun‐Hsiang Kuo; Chun‐Hsiang Kuo aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Search for other works by this author on: GSW Google Scholar Jyun‐Yan Huang; Jyun‐Yan Huang aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Search for other works by this author on: GSW Google Scholar Che‐Min Lin; Che‐Min Lin aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Search for other works by this author on: GSW Google Scholar Ting‐Yu Hsu; Ting‐Yu Hsu bDepartment of Civil and Construction Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Taipei 10607, Taiwan, [e-mail] Search for other works by this author on: GSW Google Scholar Shu‐Hsien Chao; Shu‐Hsien Chao aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Search for other works by this author on: GSW Google Scholar Kuo‐Liang Wen Kuo‐Liang Wen cDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Taoyuan City 32001, Taiwan, [e-mail] Search for other works by this author on: GSW Google Scholar Author and Article Information Chun‐Hsiang Kuo aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Jyun‐Yan Huang aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Che‐Min Lin aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Ting‐Yu Hsu bDepartment of Civil and Construction Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Taipei 10607, Taiwan, [e-mail] Shu‐Hsien Chao aNational Center for Research on Earthquake Engineering, No. 200, Section 3, Xinhai Roadz, Taipei 10668, Taiwan, [e-mail]@[e-mail]@ncree.narl.org.tw Kuo‐Liang Wen cDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Taoyuan City 32001, Taiwan, [e-mail] Publisher: Seismological Society of America First Online: 26 Sep 2018 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2019) 90 (1): 40–50. https://doi.org/10.1785/0220180195 Article history First Online: 26 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chun‐Hsiang Kuo, Jyun‐Yan Huang, Che‐Min Lin, Ting‐Yu Hsu, Shu‐Hsien Chao, Kuo‐Liang Wen; Strong Ground Motion and Pulse‐Like Velocity Observations in the Near‐Fault Region of the 2018 Mw 6.4 Hualien, Taiwan, Earthquake. Seismological Research Letters 2018;; 90 (1): 40–50. doi: https://doi.org/10.1785/0220180195 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 SocietySeismological Research Letters Search Advanced Search ABSTRACT The maximum observed peak ground acceleration (PGA) and peak ground velocity (PGV) at various stations during the 2018 Hualien, Taiwan earthquake were 594 Gal and 146 cm/s⁠, respectively. Pulse‐like velocities were observed at all stations within a distance of 4 km from the Milun fault. The horizontal spectral accelerations of the pulse‐like records indicated two obvious amplifications at periods of roughly 1 and 2 s. Natural frequencies of 0.8–1.5 Hz were observed in the region near the Milun fault using microtremor measurements. The spectral acceleration peak at periods of roughly 2 s is mostly seen in the east–west direction, indicating a typical fault‐normal seismic radiation from the fault rupture. Consequently, we contend that the amplifications of spectral acceleration at approximately 1 and 2 s were caused by site amplification and the rupture front, respectively. The site amplification at approximately 1 s may have been one reason for the collapse of medium‐rise buildings during this earthquake. Evident soil nonlinearity resulted in smaller horizontal than vertical PGA at many stations in the near‐fault region. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.