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Aftershock Sequence of the 2018 Mw 6.4 Hualien Earthquake in Eastern Taiwan from a Dense Seismic Array Data Set

2018; Seismological Society of America; Volume: 90; Issue: 1 Linguagem: Inglês

10.1785/0220180233

1938-2057

Hao Kuo‐Chen, Zhuo‐Kang Guan, Wei‐Fang Sun, Pei‐Yu Jhong, Dennis Brown,

Geological and Geochemical Analysis

Research Article| October 17, 2018 Aftershock Sequence of the 2018 Mw 6.4 Hualien Earthquake in Eastern Taiwan from a Dense Seismic Array Data Set Hao Kuo‐Chen; Hao Kuo‐Chen aDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, Taiwan, Republic of China, kuochen@ncu.edu.tw, s12085240@hotmail.com, py10662020@g.ncu.edu.tw Search for other works by this author on: GSW Google Scholar Zhuo‐Kang Guan; Zhuo‐Kang Guan aDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, Taiwan, Republic of China, kuochen@ncu.edu.tw, s12085240@hotmail.com, py10662020@g.ncu.edu.tw Search for other works by this author on: GSW Google Scholar Wei‐Fang Sun; Wei‐Fang Sun bDepartment of Natural Resources and Environmental Studies, National Dong Hwa University, No. 1, Section 2, Da Hsueh Road, Shoufeng, Hualien 97401, Taiwan, Republic of China, ttsun.sun@gmail.com Search for other works by this author on: GSW Google Scholar Pei‐Yu Jhong; Pei‐Yu Jhong aDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, Taiwan, Republic of China, kuochen@ncu.edu.tw, s12085240@hotmail.com, py10662020@g.ncu.edu.tw Search for other works by this author on: GSW Google Scholar Dennis Brown Dennis Brown cInstitute of Earth Sciences, Jaume Almera, ICTJA‐CSIC, Carrer Lluís Solé i Sabaris, s/n, 08028 Barcelona, Spain, dbrown@ictja.csic.es Search for other works by this author on: GSW Google Scholar Seismological Research Letters (2019) 90 (1): 60–67. https://doi.org/10.1785/0220180233 Article history first online: 17 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Hao Kuo‐Chen, Zhuo‐Kang Guan, Wei‐Fang Sun, Pei‐Yu Jhong, Dennis Brown; Aftershock Sequence of the 2018 Mw 6.4 Hualien Earthquake in Eastern Taiwan from a Dense Seismic Array Data Set. Seismological Research Letters 2018;; 90 (1): 60–67. doi: https://doi.org/10.1785/0220180233 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT The February 2018 Mw 6.4 earthquake in eastern Taiwan caused extensive damage in Hualien City. Although damaging earthquakes are common in this region, there are relatively few permanent seismic stations deployed. Two days after the mainshock, we deployed 70 temporary seismic stations around Hualien City for 12 days (8–19 February), and station spacing was 1–5 km. During this time, 2192 aftershocks were located from which 580 focal mechanisms were determined. The aftershock sequence extended about 25 km southwestward from the epicenter of the mainshock into the Longitudinal Valley and to depths between 5 and 15 km. Earthquake hypocenters indicate that the aftershocks took place along a near‐vertical to steeply west‐dipping plane in the north that becomes more diffuse in the south. Focal mechanisms are predominantly extensional, different than the left‐lateral strike slip with thrust‐component faulting of the mainshock. Very few events occurred in the uppermost crust at depths of less than 5 km, and their focal mechanisms are left‐lateral strike‐slip faulting. From the mainshock to the aftershocks, the stress changed rapidly from a north‐northwest‐oriented compressional axis (P axis) to the same direction for the extensional axis (T axis). You do not currently have access to this article.