Coseismic Slip in the 2016<i>M</i>_w 7.8 Ecuador Earthquake Imaged from Sentinel‐1A Radar Interferometry

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Research Article| January 25, 2017 Coseismic Slip in the 2016 Mw 7.8 Ecuador Earthquake Imaged from Sentinel‐1A Radar Interferometry Ping He; Ping He aHubei Subsurface Multi‐scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Chinawangqi@cug.edu.cn Search for other works by this author on: GSW Google Scholar Eric A. Hetland; Eric A. Hetland bDepartment of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109 U.S.A.ehetland@umich.edu Search for other works by this author on: GSW Google Scholar Qi Wang; Qi Wang aHubei Subsurface Multi‐scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Chinawangqi@cug.edu.cn Search for other works by this author on: GSW Google Scholar Kaihua Ding; Kaihua Ding cFaculty of Information Engineering, China University of Geosciences, Wuhan 430074, China Search for other works by this author on: GSW Google Scholar Yangmao Wen; Yangmao Wen dSchool of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China Search for other works by this author on: GSW Google Scholar Rong Zou Rong Zou aHubei Subsurface Multi‐scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Chinawangqi@cug.edu.cn Search for other works by this author on: GSW Google Scholar Author and Article Information Ping He aHubei Subsurface Multi‐scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Chinawangqi@cug.edu.cn Eric A. Hetland bDepartment of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109 U.S.A.ehetland@umich.edu Qi Wang aHubei Subsurface Multi‐scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Chinawangqi@cug.edu.cn Kaihua Ding cFaculty of Information Engineering, China University of Geosciences, Wuhan 430074, China Yangmao Wen dSchool of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China Rong Zou aHubei Subsurface Multi‐scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Chinawangqi@cug.edu.cn Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2017) 88 (2A): 277–286. https://doi.org/10.1785/0220160151 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Ping He, Eric A. Hetland, Qi Wang, Kaihua Ding, Yangmao Wen, Rong Zou; Coseismic Slip in the 2016 Mw 7.8 Ecuador Earthquake Imaged from Sentinel‐1A Radar Interferometry. Seismological Research Letters 2017;; 88 (2A): 277–286. doi: https://doi.org/10.1785/0220160151 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 Mw 7.8 Ecuador earthquake on 16 April 2016 is the sixth earthquake larger than Mw 7 to rupture the subduction megathrust between the Nazca and South American plates since the Mw 8.8 Colombia–Ecuador earthquake in 1906. We use Interferometric Synthetic Aperture Radar (InSAR) images from Sentinel‐1A to determine coseismic surface displacements associated with this earthquake. The interferograms exhibit a relatively simple pattern of deformation, with maximum displacements of 0.7 and 0.3 m on the descending and ascending images, respectively. We invert the interferograms for both rupture geometry and slip distribution in the earthquake. We find that the data are best described by slip on a fault dipping 17° to the east and that these InSAR data cannot uniquely constrain the strike. The maximum inferred slip is just over 2.5 m at about 20 km depth, with the main slip in the depth range of about 10–25 km. The geodetic moment of our preferred slip model is 7.15×1020 N·m, equivalent to Mw 7.87. Our results suggest that there is little, if any, partitioning of the oblique plate convergence. The 2016 Ecuador earthquake is coincident with the location of the 1942 Mw 7.8 earthquake, with both earthquakes most likely rupturing an asperity that also failed in the 1906 Mw 8.8 earthquake. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.