NDLI: Shear Velocity Structure and Anisotropy in the Crust and Upper Mantle Beneath SE Tibet From Ambient Noise and Teleseismic Surface Wave Array Tomography

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Shear Velocity Structure and Anisotropy in the Crust and Upper Mantle Beneath SE Tibet From Ambient Noise and Teleseismic Surface Wave Array Tomography

Content Provider	Semantic Scholar
Author	Yao, Huan Xin Hilst, Robert D. Van Der Meltzer, Anne S.
Copyright Year	2007
Abstract	AB: Southeastern Tibet plays a very important role in the dynamic evolution of the Tibetan Plateau. Models of middle or lower crustal channel flow have been proposed to explain the deformation and tectonics in Tibet. High resolution array tomography can help to determine the existence and geometry of low velocity layers (LVLs) in the crust where channel flow may occur. In this study we adopt recent tomographic method from ambient noise and teleseismic surface wave array analysis to study the shear velocity structure and azimuthal anisotropy in the crust and upper mantle beneath SE Tibet using data from temporary array stations deployed by MIT and Lehigh University in 2003-2004. We measure Rayleigh wave phase velocity dispersion curves in the period band 10-50 s from inter-station empirical Green's functions recovered by 10 months continuous recordings. We also measure phase velocity dispersion curve in the period band 20-200 s from teleseismic surface wave two-station analysis. In the period of overlap (20-50 s), ambient noise and two-station analysis yield very similar dispersion. Finally we average dispersion data from ambient noise and two-station analysis to obtain inter-station dispersion curves in the period band 10-200 s, and then produce 2-D phase velocity maps at each period. The path coverage is very dense, yielding a horizontal resolution 50-100 km in the crust and 100-200 km in the upper mantle. Neighborhood algorithm is used to invert the point-wise dispersion curve at each grid point from 2-D phase velocity maps for the 1-D shear velocity structure. Finally we combine all the point-wise 1-D models to construct 3-D shear velocity
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ees.lehigh.edu/groups/corners/abstracts/yao-aguF2007.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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