Horizontal Deformation Rate Analysis Based on Multiepoch GPS Measurements in Shanghai
Publication: Journal of Surveying Engineering
Volume 134, Issue 4
Abstract
By applying integrated least-squares adjustment of multicampaigns geographic positioning system (GPS) measurements, the velocity of any GPS monument can be obtained. The resulting velocities are used to estimate the strain rate tensors and their variances under infinitesimal strain assumption in a discrete triangle. In this paper, the GPS measurements of five campaigns, which were carried out in Shanghai City from 2002 to 2005, are used to determine the velocity of each GPS monument. Then the horizontal strain rate tensors are calculated with the relative velocities of the sites obtained. The analysis of these principal strain rates together with a comparison of the geological information is performed. The patterns of the principal strain rates show a significant northwest to southeast extension zone in the southwestern part of Shanghai, which agrees well with the neo-tectonic activity of an existing geological fault, the so-called “Dachang–Zhoupu” fault.
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Acknowledgments
This work is the result of the Project Based Personal Exchange Program, PPP-China Grant No. (UNSPECIFIEDDAAD- D/05/26060), which is supported by the German Academic Exchange Service (DAAD) and China Education Ministry. Three anonymous reviewers provided us with constructive comments and detailed remarks in the first version of this paper. All this support is gratefully acknowledged.
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Published In
Journal of Surveying Engineering
Volume 134 • Issue 4 • November 2008
Pages: 132 - 137
Copyright
© 2008 ASCE.
History
Received: Jun 21, 2007
Accepted: Jan 15, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
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