气候变化领域集成服务门户(CCPortal): Crustal seismogenic structures and deformation styles along the Longmen Shan Fault belt in the eastern Tibetan Plateau inferred from ambient noise tomography

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DOI	10.1016/j.tecto.2020.228689
	Crustal seismogenic structures and deformation styles along the Longmen Shan Fault belt in the eastern Tibetan Plateau inferred from ambient noise tomography
	Feng M.; Qian H.; Mechie J.; An M.; Li H.; Xue G.; Su H.; Cui X.
发表日期	2021
ISSN	401951
卷号	798
英文摘要	A seismic array comprising 80 broadband stations with ~10–20 km inter-station distances was deployed along the Longmen Shan fault belt (LMSF), the eastern boundary of the Tibetan Plateau. The recorded ambient noise data provided densely distributed inter-station cross-correlated surface waves. A new 3-D crustal S-wave velocity model for the LMSF was constructed by carrying out ambient noise tomography. The inverted model strongly improved data fitting and decreased data misfit compared to the reference (initial) model. The model highlights several crustal structure features. The Baoxing and Pengguan Massifs on the mountain side of the southern-to-middle LMSF exhibit relatively high crustal velocities, probably indicating strong crust. Low crustal velocities that may reflect weak, deformable brittle crust, exist mainly beneath the middle-to-northern segment of the LMSF and partly around the periphery of the Baoxing and Pengguan Massifs in its southern-to-middle segment. Two SW dipping low-velocity (weak) belts approximately perpendicular to the LMSF are imaged respectively around the Wenchuan-earthquake hypocenter in the south and Beichuan in the north. The low velocities in the two belts may focus movement of the eastern Tibetan Plateau relative to the Sichuan Basin (Yangtze Craton), and the uplift of the Tibetan Plateau over long time periods. Based on the velocity and tectonic structures, the young, high topography and thickened crust but low GPS shortening rates around the southern-to-middle LMSF may be due to the dominant effect of vertical crustal deformation caused by the existence of the strong Baoxing and Pengguan Massifs. This would then be in contrast to the characteristic lateral movements due to ductile crustal flow or weak, deformable brittle crust typical of the middle-to-northern LMSF. © 2020 Elsevier B.V.
英文关键词	Ambient noise tomography; Crustal deformation; Crustal S-wave velocity; Longmen Shan Fault belt; Tibetan Plateau
语种	英语
scopus关键词	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158325
作者单位	Chinese Academy of Geological Sciences; Beijing; 100037; China; Institute of Geology; Chinese Academy of Geological Sciences; Beijing; 100037; China; Deutsches GeoForschungsZentrum – GFZ; Section “Geophysical Deep Sounding”; Telegrafenberg; Potsdam; 14473; Germany; Institute of Mineral Resources; Chinese Academy of Geological Sciences; Beijing; 100037; China
推荐引用方式 GB/T 7714	Feng M.,Qian H.,Mechie J.,et al. Crustal seismogenic structures and deformation styles along the Longmen Shan Fault belt in the eastern Tibetan Plateau inferred from ambient noise tomography[J],2021,798.
APA	Feng M..,Qian H..,Mechie J..,An M..,Li H..,...&Cui X..(2021).Crustal seismogenic structures and deformation styles along the Longmen Shan Fault belt in the eastern Tibetan Plateau inferred from ambient noise tomography.,798.
MLA	Feng M.,et al."Crustal seismogenic structures and deformation styles along the Longmen Shan Fault belt in the eastern Tibetan Plateau inferred from ambient noise tomography".798(2021).