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Seismic Imaging of Source Region in the 1976 Ms 7.8 Tangshan Earthquake Sequence and Its Implications for the Seismogenesis of Intraplate Earthquakes

2018; Seismological Society of America; Volume: 108; Issue: 3A Linguagem: Inglês

10.1785/0120170389

1943-3573

Zhiwei Li, Sidao Ni, S. W. Roecker, Feng Bao, Xing Wei, David A. Yuen,

Earthquake Detection and Analysis

Research Article| May 01, 2018 Seismic Imaging of Source Region in the 1976 Ms 7.8 Tangshan Earthquake Sequence and Its Implications for the Seismogenesis of Intraplate Earthquakes Zhiwei Li; Zhiwei Li aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, No. 340, Xudong Street, Wuhan 430077, China, zwli@whigg.ac.cn Search for other works by this author on: GSW Google Scholar Sidao Ni; Sidao Ni aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, No. 340, Xudong Street, Wuhan 430077, China, zwli@whigg.ac.cn Search for other works by this author on: GSW Google Scholar Steven Roecker; Steven Roecker bDepartment of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180 Search for other works by this author on: GSW Google Scholar Feng Bao; Feng Bao aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, No. 340, Xudong Street, Wuhan 430077, China, zwli@whigg.ac.cn Search for other works by this author on: GSW Google Scholar Xing Wei; Xing Wei cChina Earthquake Networks Center, No. 5, Sanlihenanheng Street, Xicheng District, Beijing 100045, China Search for other works by this author on: GSW Google Scholar David A. Yuen David A. Yuen dDepartment of Earth Sciences, University of Minnesota, 100 Church Street S.E., Minneapolis, Minnesota 55455eAlso at Ultimate Vision Technology, Beijing 100190, China. Search for other works by this author on: GSW Google Scholar Author and Article Information Zhiwei Li aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, No. 340, Xudong Street, Wuhan 430077, China, zwli@whigg.ac.cn Sidao Ni aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, No. 340, Xudong Street, Wuhan 430077, China, zwli@whigg.ac.cn Steven Roecker bDepartment of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180 Feng Bao aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, No. 340, Xudong Street, Wuhan 430077, China, zwli@whigg.ac.cn Xing Wei cChina Earthquake Networks Center, No. 5, Sanlihenanheng Street, Xicheng District, Beijing 100045, China David A. Yuen dDepartment of Earth Sciences, University of Minnesota, 100 Church Street S.E., Minneapolis, Minnesota 55455eAlso at Ultimate Vision Technology, Beijing 100190, China. Publisher: Seismological Society of America First Online: 01 May 2018 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2018) 108 (3A): 1302–1313. https://doi.org/10.1785/0120170389 Article history First Online: 01 May 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Zhiwei Li, Sidao Ni, Steven Roecker, Feng Bao, Xing Wei, David A. Yuen; Seismic Imaging of Source Region in the 1976 Ms 7.8 Tangshan Earthquake Sequence and Its Implications for the Seismogenesis of Intraplate Earthquakes. Bulletin of the Seismological Society of America 2018;; 108 (3A): 1302–1313. doi: https://doi.org/10.1785/0120170389 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 SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract One of the most devastating earthquakes in the last 100 years is the Ms 7.8 Tangshan intraplate earthquake occurred on 28 July 1976, caused more than 240,000 deaths, and razed the city of Tangshan. To investigate the possible dynamic mechanisms of the Tangshan earthquake, we conducted high‐resolution seismic imaging with an extensive dataset of arrival times of P and S waves from locally recorded microearthquakes at 56 stations. Detailed 3D images of VP⁠, VS⁠, and VP/VS show a sharp velocity contrast to about 25 km depth coinciding with a high rate of seismicity. This contrast likely corresponds to the high‐angle strike‐slip Tangshan fault that ruptured during the earthquake. The rupture zone is roughly defined by high‐VP⁠, high‐VS⁠, and low‐VP/VS anomalies that suggest that the media surrounding the fault is strong enough to accumulate the strain energy necessary for the coseismic slip related to the Tangshan earthquake. Migration of magma from the mantle into the lower crust could be potentially a key factor in the dynamics of large intraplate earthquakes within the North China craton. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.