globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228689
论文题名:
Crustal seismogenic structures and deformation styles along the Longmen Shan Fault belt in the eastern Tibetan Plateau inferred from ambient noise tomography
作者: Feng M.; Qian H.; Mechie J.; An M.; Li H.; Xue G.; Su H.; Cui X.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 798
语种: 英语
中文关键词: Ambient noise tomography ; Crustal deformation ; Crustal S-wave velocity ; Longmen Shan Fault belt ; Tibetan Plateau
英文关键词: Acoustic noise ; Deformation ; Earthquakes ; Faulting ; Percolation (fluids) ; Shear waves ; Structural geology ; Surface waves ; Tomography ; Topography ; Wave propagation ; Ambient noise tomographies ; Broadband station ; Crustal deformations ; Crustal structure ; Eastern Tibetan plateau ; Seismogenic structures ; Tectonic structure ; Wenchuan Earthquake ; Velocity ; ambient noise ; crustal deformation ; crustal structure ; data processing ; S-wave ; seismic tomography ; seismic velocity ; China ; Longmenshan Fault Zone ; Qinghai-Xizang Plateau ; Sichuan
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.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170804
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


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

Recommended Citation:
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]. Tectonophysics,2021-01-01,798
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Feng M.]'s Articles
[Qian H.]'s Articles
[Mechie J.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Feng M.]'s Articles
[Qian H.]'s Articles
[Mechie J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Feng M.]‘s Articles
[Qian H.]‘s Articles
[Mechie J.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.