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| Co-seismic deformation derived from GPS observations during April 20th, 2013 Lushan Earthquake, Sichuan, China |
| Yujun Du1, 2, Zemin Wang2, Shujiang Yang3, Jiachun An2, Qiang Liu1, Guowei Che2, 4 |
1 School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2 Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China
3 Research Center of GNSS, Wuhan University, Wuhan 430079, China
4 Tianjin Institute of Surveying and Mapping, Tianjin 300381, China |
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Abstract We process the standard 30 s, static GPS data and the 1 s, high-rate GPS (HRGPS) data provided by the Crustal Movement Observation Network of China with GAMIT/GLOBK software package, and obtain the coseismic displacements of near field and far field, and the epoch-by-epoch time series of HRGPS during Lushan earthquake. GPS data from about 20 sites in Sichuan province, which located between 40 and 450 km from the epicenter, are analyzed so as to study the characteristics of the static displacements and the dynamic crustal deformations, with periods ranging from several minutes to over a month. The result shows that: the static displacements caused by Lushan earthquake are limited to several centimeters; the nearest station SCTQ at 43 km from the epicenter has the largest static displacement of about 2 cm, while the other stations generally have insignificant displacements of less than 5 mm. the stations in the east of Sichuan–Yunnan region shifts 5–10 mm toward the southwest, and the stations in the middle-west of Sichuan Basin moves indistinctively 1–2 mm toward the northwest; station SCTQ has the largest kinematic displacement of about 4 and 3 cm peak-to-peak on the north and east component, respectively, and is much greater than the static permanent displacement; for the stations located at a distance greater than 150 km from the epicenter, the kinematic motions are generally insignificant; exceptionally, station SCNC and station SCSN in central Sichuan Basin have significant kinematic motions although they are more than 200 km away from the epicenter.
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Received: 24 June 2013
Published: 30 October 2013
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| Fund:the National Natural Science Foundation of China (Granted Nos. 41174029 and 41204028), the Polar Strategic Research Foundation of China (Granted No. 20110205), the Open Research Fund of Key Laboratory for Polar Science of State Oceanic Administration (Granted No. KP201201), and the Science and Technology Project of National Administration of Surveying, Mapping, and Geoinformation (Granted name Polar Geomatics Technology Test) |
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Corresponding Authors:
Zemin Wang
E-mail: zmwang@whu.edu.cn
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