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《Chinese Journal of Geophysics》 2002-03
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GPS INVERSION OF KINEMATIC MODEL OF THE MAIN BOUNDARIES OF THE RHOMBUS BLOCK IN SICHUAN AND YUNNAN

SHEN CHONG YANG WANG QI WU YUN YOU XIN ZHAO GAN JIA SI YANG SHAO MIN(Institute of seismology, CSB, Wuhan 430071, China)  
Based on GPS observation between 1991 and 1999 in Sichuan and Yunnan, we apply the robust Baye's least squares estimation and multi fault dislocation models to analyze the kinematic models of the main boundaries of the rhombus block in Sichuan and Yunnan. The geodetic inversion suggests that the left lateral strike slip rates of the Xianshuihe fault zone and the Anninghe fault zone in Sichuan are about 30 mm/a with overthrust faulting at rates of roughly 9 and 11 mm/a, respectively; in Yunnan, the right lateral strike slip rate of the Red River (Honghe) fault zone is 10 mm/a with a normal faulting of 16 mm/a; and the left lateral strike slip rates of the Chenghai fault zone and the Heqing-Eryuan fault zone are about 11 and 13 mm/a with the normal faulting at rates of about 24 and 16 mm/a, respectively. If all displacements along these faults were accommodated by elastic stress and strain, the accumulated seismic energy each fault would be sufficient to produce a moderate earthquake with M S~6 each year. According to above results, the horizontal displacement and strain field caused by the main fault movement have simulated and showed the interactions among boundary faults.
【Fund】: 国家 973计划项目 (G1 9980 40 70 3 ) ;; 国家科技攻关项目 (0 9-0 2 -0 2 -0 4)
【CateGory Index】: P631.4
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