ANALYSIS OF SPATIAL DISTRIBUTION OF STRAIN AT EASTERN
MARGIN OF TIBETAN PLATEAU
1)College of Surveying and Geoinformatics, Tongji University, Shanghai 200092
2)Institute of Earthquake Science, CEA, Beijing 100036
3)key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA, Wuhan 430071
4)School of Surveying and Land Information Engineering of Henan Polytechnic University,Jiaozuo 454000
Abstract Current strain field in the eastern margin of the Tibetan Plateau was calculated with the triangle methodthe triangle method using observation data of the Continental Tectonic Environmental Monitoring Network of China during the period of 2009—2011, and calculated results were tested with Triangular shape factor and strain significance.The observation region is divided into interior, edge and boundary according to the obtained strain characteristics. Longmenshan fault zone of the eastern margin of the Tibetan Plateau has become a district wiyh high values of strain after Ms8.0 Wenchuan earthquake, which reflects the block relaxation and deformation adjustment after the earthquake. Xianshuihe fault is still a district with largest strain, and it’s very important to monitor it continuously.
