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Active tectonics and intracontinental earthquakes in China; the kinematics and geodynamics

Mian Liu, Youqing Yang, Shen Zhengkang, Shimin Wang, Wang Min and Wan Yongge
Active tectonics and intracontinental earthquakes in China; the kinematics and geodynamics (in Continental intraplate earthquakes; science, hazard, and policy issues, Seth Stein (editor) and Stephane Mazzotti (editor))
Special Paper - Geological Society of America (2007) 425: 299-318

Abstract

China is a country of intense intracontinental seismicity. Most earthquakes in western China occur within the diffuse Indo-Eurasian plate-boundary zone, which extends thousands of kilometers into Asia. Earthquakes in eastern China mainly occur within the North China block, which is part of the Archean Sino-Korean craton that has been thermally rejuvenated since late Mesozoic. Here, we summarize neotectonic and geodetic results of crustal kinematics and explore their implications for geodynamics and seismicity using numerical modeling. Quaternary fault movements and global positioning system (GPS) measurements indicate a strong influence of the Indo-Asian collision on crustal motion in continental China. Using a spherical three-dimensional (3-D) finite-element model, we show that the effects of the collisional plate-boundary force are largely limited to western China, whereas gravitational spreading of the Tibetan Plateau has a broad impact on crustal deformation in much of Asia. The intense seismicity in the North China block, and the lack of seismicity in the South China block, may be explained primarily by the tectonic boundary conditions that produce high deviatoric stresses within the North China block but allow the South China block to move coherently as a rigid block. Within the North China block, seismicity is concentrated in the circum-Ordos rifts, reflecting the control of lithospheric heterogeneity. Finally, we calculated the change of Coulomb stresses associated with 49 major (M> or =6.5) earthquakes in the North China block since 1303. The results show that approximately 80% of these events occurred in regions of increasing Coulomb stresses caused by previous events.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 425
Title: Active tectonics and intracontinental earthquakes in China; the kinematics and geodynamics
Title: Continental intraplate earthquakes; science, hazard, and policy issues
Author(s): Liu, MianYang, YouqingShen ZhengkangWang, ShiminWang MinWan Yongge
Author(s): Stein, Setheditor
Author(s): Mazzotti, Stephaneeditor
Affiliation: University of Missouri, Department of Geological Sciences, Columbia, MO, United States
Affiliation: Northwestern University, Department of Earth and Planetary Sciences, Evanston, IL, United States
Pages: 299-318
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-5137-2425-6
References: 84
Accession Number: 2008-040031
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
Secondary Affiliation: Geological Survey of Canada, CAN, CanadaInstitute of Geology, CHN, ChinaSchool of Diaster Prevention Techniques, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200812
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