Lithospheric delamination and upwelling asthenosphere in the Longmenshan area: insight from teleseismic P-wave tomography

We apply teleseismic P-wave tomography to reconstruct the velocity structure of the Longmenshan area. Our results show possible large-scale delamination beneath the Songpan-Ganzi and Qiangtang terranes, which induced upwelling asthenosphere. Upwelling asthenosphere might have led to lower crust heat...

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Bibliographic Details
Published inScientific reports Vol. 9; no. 1; p. 6967
Main Authors He, Chuansong, Dong, Shuwen, Wang, Yanghua
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 06.05.2019
Nature Publishing Group
Subjects
704/2151/2809
704/2151/508
704/2151/562
Earthquakes
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Seismic activity
Tomography
Upwelling
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Summary:We apply teleseismic P-wave tomography to reconstruct the velocity structure of the Longmenshan area. Our results show possible large-scale delamination beneath the Songpan-Ganzi and Qiangtang terranes, which induced upwelling asthenosphere. Upwelling asthenosphere might have led to lower crust heating, facilitating eastward extrusion of the Songpan Ganzi terrane resulting in localized deformation and uplift along the Longmenshan orogenic belt. We suggest that the eastward extrusion of the Songpan-Ganzi terrane against the rigid lithospheric root of the Sichuan Basin results in stress accumulation and release, leading to large earthquakes in the Longmenshan area.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-43476-0