DOI: 10.1002/2013GL058476
论文题名: Low wave speed zones in the crust beneath SE Tibet revealed by ambient noise adjoint tomography
作者: Chen M. ; Huang H. ; Yao H. ; Van Der Hilst R. ; Niu F.
刊名: Geophysical Research Letters
ISSN: 0094-10442
EISSN: 1944-10173
出版年: 2014
卷: 41, 期: 2 起始页码: 334
结束页码: 340
语种: 英语
英文关键词: Adjoint tomography
; Ambient noise
; Empirical Green's Functions
; SE Tibet
Scopus关键词: Acoustic noise
; Green's function
; Iterative methods
; Shear waves
; Tomography
; Adjoints
; Ambient noise
; Empirical green's functions
; Finite-frequency kernels
; Frequency-dependent
; Preconditioned conjugate gradient method
; Spectral element method
; Western Sichuan basin
; Three dimensional
; ambient noise
; crust
; Green function
; S-wave
; spectral analysis
; three-dimensional modeling
; wave velocity
; China
; Xizang
英文摘要: We present a refined 3D crustal model beneath SE Tibet from ambient noise adjoint tomography. Different from ray-theory-based tomography, adjoint tomography in this study incorporates a spectral-element method (SEM) and takes empirical Green's functions (EGFs) of Rayleigh waves from ambient noise interferometry as the direct observation. The frequency-dependent traveltime misfits between SEM synthetic Green's functions and EGFs are minimized with a preconditioned conjugate gradient method, meanwhile the 3D model gets improved iteratively utilizing 3D finite-frequency kernels. The new model shows 3 - 6% shear wave speed increasing beneath the western Sichuan Basin (SCB) (depth > 15 km) and the central Chuan-Dian Block (CDB), and 6 - 12% shear wave speed reduction in the mid-lower crust beneath the northern and the southern CDB. The inferred spatial pattern of low wave speed zones, consistent with possible partial melt, suggests more complex and disconnected geometry than the pervasive narrow zone from the channel flow models. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892633729&doi=10.1002%2f2013GL058476&partnerID=40&md5=9979d331126a841d2720c682dcc34f37
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7706
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Chen M.,Huang H.,Yao H.,et al. Low wave speed zones in the crust beneath SE Tibet revealed by ambient noise adjoint tomography[J]. Geophysical Research Letters,2014-01-01,41(2).