Seismic and Aseismic Fault Slip Associated with the 2017 Mw 8.2 Chiapas, Mexico, Earthquake Sequence

Research Article| February 27, 2019 Seismic and Aseismic Fault Slip Associated with the 2017 Mw 8.2 Chiapas, Mexico, Earthquake Sequence Rumeng Guo; Rumeng Guo aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Xudong Road 340#, Wuhan 430077, Hubei Province, ChinadAlso at State Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Lumi Road 388#, Wuhan 430074, Hubei Province, China; and College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Yuquan Road 19#, Shijingshan District, Beijing 100049, China. Search for other works by this author on: GSW Google Scholar Yong Zheng; Yong Zheng bState Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Lumi Road 388#, Wuhan 430074, Hubei Province, China, zhengyong@cug.edu.cn Search for other works by this author on: GSW Google Scholar Jianqiao Xu; Jianqiao Xu aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Xudong Road 340#, Wuhan 430077, Hubei Province, China Search for other works by this author on: GSW Google Scholar Zhongshan Jiang Zhongshan Jiang cSouthwest Jiaotong University Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Xipu Campus, 999 Xi‐An Road, Pidu District, Chengdu 611756, Sichuan Province, China Search for other works by this author on: GSW Google Scholar Author and Article Information Rumeng Guo aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Xudong Road 340#, Wuhan 430077, Hubei Province, ChinadAlso at State Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Lumi Road 388#, Wuhan 430074, Hubei Province, China; and College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Yuquan Road 19#, Shijingshan District, Beijing 100049, China. Yong Zheng bState Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Lumi Road 388#, Wuhan 430074, Hubei Province, China, zhengyong@cug.edu.cn Jianqiao Xu aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Xudong Road 340#, Wuhan 430077, Hubei Province, China Zhongshan Jiang cSouthwest Jiaotong University Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Xipu Campus, 999 Xi‐An Road, Pidu District, Chengdu 611756, Sichuan Province, China Publisher: Seismological Society of America First Online: 27 Feb 2019 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2019) 90 (3): 1111–1120. https://doi.org/10.1785/0220180262 Article history First Online: 27 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 Rumeng Guo, Yong Zheng, Jianqiao Xu, Zhongshan Jiang; Seismic and Aseismic Fault Slip Associated with the 2017 Mw 8.2 Chiapas, Mexico, Earthquake Sequence. Seismological Research Letters 2019;; 90 (3): 1111–1120. doi: https://doi.org/10.1785/0220180262 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 We constructed a rupture model of the 2017 Mw 8.2 Chiapas, Mexico, earthquake by incorporating teleseismic waveform data and static Global Positioning System (GPS) displacements and analyzed the transient postseismic deformation. The high‐slip coseismic rupture region spanned ∼80 km along strike and ∼70 km along dip, with a peak slip of 11.6 m, mean stress drop of ∼91 bars⁠, and seismic moment of 2.61×1021 N·m (⁠Mw 8.2). After six months, postseismic deformation was mainly dominated by afterslip concentrated in several patches around the coseismic rupture, which was consistent with aftershock locations and previous observations of afterslip following large earthquakes. Aftershocks can be mostly explained by Coulomb failure stress (CFS) changes induced by the mainshock rupture and afterslip process. We found that afterslip released approximately 54.7% of the coseismic moment and was accommodated ∼98.4% aseismically and ∼1.6% seismically by aftershocks, indicating that aftershocks were likely driven by afterslip following this great intraplate event. Our results provided important insights into the seismogenic structure and mechanisms for stress accumulation and release in the Mexican subduction zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.