DOI: 10.1002/grl.50202
论文题名: Ambient-noise tomography of north Tibet limits geological terrane signature to upper-middle crust
作者: Karplus M.S. ; Klemperer S.L. ; Lawrence J.F. ; Zhao W. ; Mechie J. ; Tilmann F. ; Sandvol E. ; Ni J.
刊名: Geophysical Research Letters
ISSN: 0094-9258
EISSN: 1944-8989
出版年: 2013
卷: 40, 期: 5 起始页码: 808
结束页码: 813
语种: 英语
英文关键词: ambient noise
; Rayleigh-wave tomography
; Tibetan Plateau
Scopus关键词: Ambient noise
; Group velocities
; Low velocities
; Regional differences
; South-to-North
; Striking velocity
; Tibetan Plateau
; Upper-middle crust
; Tectonics
; Tomography
; Velocity
; accretion
; ambient noise
; Cenozoic
; crust
; geological mapping
; Rayleigh wave
; wave velocity
; China
; Himalayas
; Xizang
英文摘要: We use ambient-noise tomography to map regional differences in crustal Rayleigh-wave group velocities with periods of 8-40 s across north Tibet using the International Deep Profiling of Tibet and the Himalaya phase IV arrays (132 stations, deployed for 10-24 months). For periods of 8-24 s (sensitive to midcrustal depths of ∼5-30 km), we observe striking velocity changes across the Bangong-Nujiang and Jinsha suture zones as well as the Kunlun-Qaidam boundary. From south to north, we see higher velocities beneath the Lhasa terrane, lower velocities beneath the Qiangtang, higher velocities in the Songpan-Ganzi and Kunlun terranes, and the lowest velocities beneath the Qaidam Basin. Maps at periods of 34 and 40 s (sensitive to the middle and lower crust at depths of ∼30-60 km) do not show evidence of changes across those boundaries. Any differences between the Tibetan terrane lower crusts that were present at accretion have been erased or displaced by Cenozoic processes and replaced almost ubiquitously by uniformly low velocities. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876805983&doi=10.1002%2fgrl.50202&partnerID=40&md5=068e9785e0cf5c1a37d7c98d8dce6d36
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6522
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geophysics, Stanford University, Stanford, CA, United States
Recommended Citation:
Karplus M.S.,Klemperer S.L.,Lawrence J.F.,et al. Ambient-noise tomography of north Tibet limits geological terrane signature to upper-middle crust[J]. Geophysical Research Letters,2013-01-01,40(5).