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《Progress In Geophysics》 2005-04
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The postseismic deformation analysis based on crustal layering due to Tangshan earthquake fault

LI Zhi-cai~(1,2),XU Cai-jun~(2),ZHAO Shao-rong~(3),WEN Yang-mao~(2) (1.Geodesy department,National Geomatics Center of China,Beijing 100044,China;2.School of Geodesy and Geomatics,the Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,Wuhan 430079,China;3.Geoscience Earth Monitoring,Geoscience Australia,Canberra ACT 2601,Australia)  
The spherical visco-elastic earth model has been used to study the postseismic accumulated 28 years deformation field based on the crustal layering due to Tangshan seismic fault in 1976,compute the accumulated postseismic deformation field due to four different type models(three crustal layering models and one homogeneous model),analyze the different effect by the four models,quantitatively compare the difference of surface deformation between the realistic crustal layering and homogeneous model.The computation result shows that the difference of horizontal deformation is about 20mm comparing the results get from the different models,while the difference of vertical deformation is about 10mm.These results illustrate that the effect on post seismic deformation by different crustal structure is so large that exceeds the precision of high accuracy observation technology.If one wants to use the observation data to do the inversion research,the effect by the stratified crutal structure could not been ignored.
【Fund】: 国家自然科学基金项目(40344023);; 中国科学院动力大地测量学重点实验室基金项目(L04-02);; 地球空间环境与大地测量教育部重点实验室开放研究基金(测绘基础研究)项目(905276031-04-08)联合资助
【CateGory Index】: P315.2
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