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Shear wave tomography of China using joint inversion of body and surface wave constraints
 

Summary: Shear wave tomography of China using joint inversion of body
and surface wave constraints
Mathias Obrebski,1,2
Richard M. Allen,1
Fengxue Zhang,3
Jiatie Pan,3
Qingju Wu,3
and Shu-Huei Hung4
Received 7 March 2011; revised 16 November 2011; accepted 17 November 2011; published 26 January 2012.
[1] The India-Eurasia collision and the decratonization of the North China Craton have
drawn much attention from the scientific community. Here we provide the first large-scale
S wave velocity model for China (CH11-S) based on constraints from both teleseismic
surface and body waves. We take advantage of the recent deployment of the 140 permanent
stations of the Chinese Digital Seismic Network and temporary network deployments to
resolve both the lithospheric and deeper mantle structure. Slow velocities are widespread in
the crust and upper mantle. Deeply rooted fast anomalies are located beneath the stable
Yangtze Craton and the western (Ordos) block of the North China Craton. An upper mantle
fast anomaly is observed beneath the eastern block of the North China Craton and
could represent thermally eroded or delaminated Precambrian lithosphere. Another flat and
fast feature appears beneath the Tibetan Plateau from 50 to 250 km depth. This may

  

Source: Allen, Richard M. - Seismological Laboratory, Department of Earth and Planetary Science, University of California at Berkeley

 

Collections: Geosciences