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Geology; May 2008; v. 36; no. 5; p. 363-366; DOI: 10.1130/G24450A.1
© 2008 Geological Society of America
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Evidence for mechanically coupled lithosphere in central Asia and resulting implications

Chun-Yong Wang1, Lucy M. Flesch2, Paul G. Silver3, Li-Jun Chang4 and Winston W. Chan5

1 Institute of Geophysics, China Earthquake Administration, Beijing 100081, People's Republic of China
2 Department of Earth & Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA
3 Carnegie Institution of Washington, Washington, DC 20015, USA
4 Institute of Geophysics, China Earthquake Administration, Beijing 100081, People's Republic of China
5 Multimax Corporation, 1441 McCormick Drive, Landover, Maryland 20774, USA

The recent dramatic increase in seismic anisotropy and surface global positioning system (GPS) data for central Asia permits a comprehensive examination of the mantle's role in mountain building. A joint analysis of 178 shear-wave-splitting and ~2000 GPS observations using a new technique reveals that the crust and lithospheric mantle deform coherently, arguing for crust-mantle mechanical coupling during deformation. The observed spatial variations in anisotropy reflect the large-scale pattern of lithospheric deformation, as well as a change in deformational style from simple shear on the Tibetan Plateau transitioning to pure shear in surrounding regions.

Key Words: anisotropy • lithospheric deformation • global positioning system • central Asia






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