Insights into Seismogenic Deformation during the 2018 Hualien, Taiwan, Earthquake Sequence from InSAR, GPS, and Modeling

Abstract

Research Article| October 24, 2018 Insights into Seismogenic Deformation during the 2018 Hualien, Taiwan, Earthquake Sequence from InSAR, GPS, and Modeling Jiun‐Yee Yen; Jiun‐Yee Yen aDepartment of Natural Resource and Environmental Studies, National Dong Hwa University, No. 1, Section 2, Da Hsueh Road, Shoufeng, Hualien 97401, Taiwan, [e-mail] Search for other works by this author on: GSW Google Scholar Chih‐Heng Lu; Chih‐Heng Lu bInstitute of Applied Geology, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, TaiwaniAlso at Institute for Electromagnetic Sensing of the Environment, National Research Council, Via Amendola, 122/d ‐ 70126 Bari, Italy. Search for other works by this author on: GSW Google Scholar Rebecca J. Dorsey; Rebecca J. Dorsey cDepartment of Earth Sciences, University of Oregon, 100 Cascade Hall, 1272, Eugene, Oregon 97403‐1272 U.S.A. Search for other works by this author on: GSW Google Scholar Hao Kuo‐Chen; Hao Kuo‐Chen dDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, Taiwan Search for other works by this author on: GSW Google Scholar Chung‐Pai Chang; Chung‐Pai Chang eCenter for Space and Remote Sensing Research, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, Taiwan Search for other works by this author on: GSW Google Scholar Chun‐Chin Wang; Chun‐Chin Wang aDepartment of Natural Resource and Environmental Studies, National Dong Hwa University, No. 1, Section 2, Da Hsueh Road, Shoufeng, Hualien 97401, Taiwan, [e-mail] Search for other works by this author on: GSW Google Scholar Ray Y. Chuang; Ray Y. Chuang fDepartment of Geography, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, TaiwanjAlso at Research Center for Future Earth, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, Taiwan. Search for other works by this author on: GSW Google Scholar Yu‐Ting Kuo; Yu‐Ting Kuo gInstitute of Earth Sciences, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 11529, Taiwan Search for other works by this author on: GSW Google Scholar Chi‐Yu Chiu; Chi‐Yu Chiu dDepartment of Earth Sciences, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan City 32001, Taiwan Search for other works by this author on: GSW Google Scholar Yo‐Ho Chang; Yo‐Ho Chang aDepartment of Natural Resource and Environmental Studies, National Dong Hwa University, No. 1, Section 2, Da Hsueh Road, Shoufeng, Hualien 97401, Taiwan, [e-mail] Search for other works by this author on: GSW Google Scholar Fabio Bovenga; Fabio Bovenga hInstitute for Electromagnetic Sensing of the Environment, National Research Council, Via Amendola, 122/d, 70126 Bari, Italy Search for other works by this author on: GSW Google Scholar Wen‐Yen Chang Wen‐Yen Chang aDepartment of Natural Resource and Environmental Studies, National Dong Hwa University, No. 1, Section 2, Da Hsueh Road, Shoufeng, Hualien 97401, Taiwan, [e-mail] Search for other works by this author on: GSW Google Scholar Seismological Research Letters (2019) 90 (1): 78–87. https://doi.org/10.1785/0220180228 Article history first online: 24 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 Jiun‐Yee Yen, Chih‐Heng Lu, Rebecca J. Dorsey, Hao Kuo‐Chen, Chung‐Pai Chang, Chun‐Chin Wang, Ray Y. Chuang, Yu‐Ting Kuo, Chi‐Yu Chiu, Yo‐Ho Chang, Fabio Bovenga, Wen‐Yen Chang; Insights into Seismogenic Deformation during the 2018 Hualien, Taiwan, Earthquake Sequence from InSAR, GPS, and Modeling. Seismological Research Letters 2018;; 90 (1): 78–87. doi: https://doi.org/10.1785/0220180228 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 We provide new data and insights into a 6 February 2018 Mw 6.4 earthquake that shook the city of Hualien in eastern Taiwan at the leading edge of a modern arc–continent collision. Fatalities and damages were concentrated near the Milun fault and extended south to the northern Longitudinal Valley fault. Although the Hualien area has one of the highest rates of seismicity in Taiwan, the geologic structures responsible for active deformation were not well understood before this event. We analyzed Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data and produced a 3D displacement model with InSAR and azimuth offset of radar images to document surface deformation induced by this earthquake. The 3D displacement model was inverted to estimate slip on the Milun fault. We find that models assuming a single fault are inconsistent with observations of coseismic deformation and regional strain patterns, providing evidence for linked slip on a little‐studied offshore thrust belt. Based on data presented here and elsewhere, we propose a model for transpressive deformation in a zone of oblique convergence and left‐lateral wrench tectonics to explain this and a prior 1951 M 7.3 earthquake. You do not currently have access to this article.