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The relationship between crust-lithosphere structures and seismicity on the southeastern edge of the Tibetan Plateau
Xingqian Xu1; Lijun Su2,3,4,5; Junzhe Liu2; Wanhuan Zhou6; Aimin Gong1; Xin Qu7
Source PublicationTectonophysics

The crust-lithosphere structure, especially the discontinuities such as Moho and lithosphere-asthenosphere boundary (LAB), is important in the investigation of geodynamic process implications and tectonic evolution of the lithosphere and regional seismic activity. We stacked the S receiver functions from 51 permanent broad-band stations to investigate the crust-lithosphere structures beneath the southeastern edge of the Tibetan Plateau and further discussed the mechanism of lower-crust earthquakes, the regional tectonics deformation characteristics, and the relationship between the two discontinuities and seismicity in this region. The results show that the Moho depth increases from 40 to 52 km beneath the Sichuan Basin to 56–74 km on the both western side of the Longmenshan (LMS) fault and Anninhe-Zemuhe fault. The LAB depth ranges from 130 to 170 km beneath the Sichuan Basin, and a shallow belt ranges from 100 km to 130 km around the Sichuan Basin. On the Moho depth contour map, 374 moderate earthquakes that accounted for 72.2%, corresponding to the depth range of 44–52 km and 60–68 km on the both sides of a narrow strip (longitude 102°~104°). On the LAB depth contour map, 321 earthquakes accounted for 62.15% in the depth range of 130–150 km. The variation of LAB corresponds to the increasing crustal thickness, intensive lower crustal earthquakes (hypocenters about 60 km and magnitude 4.0 ≤ Ms. ≤ 4.9) and surface abrupt elevations. It implied that Normal strong earthquakes generate the lower crustal earthquakes or aftershocks that resulted in the shear zones where fluid-induced metamorphic transformations, the eclogitization of dry granulite, and further affect the crustal thickness and deformation to control the spatial distribution of deep faults and seismicity.

KeywordLab s Wave Receiver Function Southeastern Tibet Longmenshan (Lms) Seismicity
URLView the original
Indexed BySCIE
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000518493400013
Scopus ID2-s2.0-85078828668
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Document TypeJournal article
Corresponding AuthorLijun Su
Affiliation1.College of Water Conservancy,Yunnan Agricultural University,Kunming,650201,China
2.Key Laboratory of Mountain Hazards and Earth Surface Process,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu,610041,China
3.CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing,100101,China
4.China-Pakistan joint Research Center on Earth Sciences,Islamabad,45320,Pakistan
5.University of Chinese Academy of Sciences,Beijing,100049,China
6.Department of Civil and Environmental Engineering,Faculty of Science and Technology,University of Macau,Macau,China
7.College of Civil and Architecture Engineering,Anyang Institute of Technology,455000,China
Recommended Citation
GB/T 7714
Xingqian Xu,Lijun Su,Junzhe Liu,et al. The relationship between crust-lithosphere structures and seismicity on the southeastern edge of the Tibetan Plateau[J]. Tectonophysics,2019,776:228300.
APA Xingqian Xu,Lijun Su,Junzhe Liu,Wanhuan Zhou,Aimin Gong,&Xin Qu.(2019).The relationship between crust-lithosphere structures and seismicity on the southeastern edge of the Tibetan Plateau.Tectonophysics,776,228300.
MLA Xingqian Xu,et al."The relationship between crust-lithosphere structures and seismicity on the southeastern edge of the Tibetan Plateau".Tectonophysics 776(2019):228300.
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