Analysis of GNSS Postseismic Deformation of Wenchuan Earthquake

doi:10.11947/j.AGCS.2018.20170434

Abstract

Abstract: Processing and analysis of 109 GNSS continuous stations and campaign stations after Wenchuan earthquake on both sides of the Longmen shan fault during the year of 1999-2015,we use the international high-precision data processing software to obtain the time series of horizonal coordinate for each site.Considering the effect of coseismic deformation of Lushan earthquake in 2013 and performing time series analysis,get the postseismic deformation field of 109 stations in the earthquake area during 2010-2015,maximum postseismic displacement in horizontal up to 5~7 cm in the epicenter near the upper falut.Based on the model of postseismic viscoelastic relaxation and searched by grid,inverted the best thickness of the middle to upper crustal elastic layer and the best coefficient of viscosity in viscoelastic layer of lower crust and upper mantle according to three different rupture models,and obtained the distribution of deformation from observation and simulation value of three different rupture models during 2010-2015.According to the parameters obtained by inversion of model 2,calculate the impact on crustal deformation in the surrounding area in next few decades after Wenchuan earthquake,the maximum cumulative postseismic deformation in 40 years during 2018-2058 up to 19 cm.

Key words: postseismic deformation, time series analysis, GNSS, viscoelastic relaxation, wenchuan earthquake

CLC Number:

P227

YU Jianshaneg, ZHAO Bin, TAN Kai, WANG Dongzhen. Analysis of GNSS Postseismic Deformation of Wenchuan Earthquake[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(9): 1196-1206.

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