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《EARTHQUAKE》 1999-01
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ANNUAL CHANGING RATE OF THE CRUSTAL STRAINENERGY DENSITY AND ACTIVITY OF STRONG EARTHQUAKES IN CHINA'S CONTINENT

Zhang Dongning;Xu Zhonghuai(Institute of Geophysics, CSB, Beijing 100081, China)  
The annual changing rates of the crustal strain-energy density in China's continent are calculated by using the finite element method , and the calculation is constrained with the tectonic stress field and the GPS results of crustal motion. The numerical model is constructed with 3-D elasto-viscous body, and some large-scale active faults are involved.Gravity and buoyancy forces are considered in Tibetan plateau. Some boundary loading is applied as convergence of Eurasia plate with Pacific plate and indian plate. The calculation results are compared with the distribution map of strong earthquakes in China. The transitional zones of the positive and negative strain-energy changing rate areas are just corresponding to Longmenshan fault , Yanshan-Yinshan E-W tectonic zone, Tianshan tectonic zone f Xianshuihe-Xiaojiang fault, Honghe fault , faults around Erdos block, which are all the strong earthquake zones in history. The recurrence interval of the strong earthquakes is evaluated with the calculation results of the changing rates of the crustal strain-energy density. The recurrence Interval in western China should be 250 years or so 1 and it may be longer in eastern China.
【Fund】: 中国地震局“九五”科研攻关项目!95-04
【CateGory Index】: P315.727
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