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《Earthquake》 2003-02
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Great seismic activities by regions in China's mainland and its vicinity and their evolvement with time

TAO Wei, HONG Han-jing, LIU Pei-xun, YU Yong, ZHENG Xiu-zhen (Institute of Geology, CSB, Beijing 100029, China)  
Based on seismicity patterns, tectonic background and gradual seismic changes, the study region, which covers China's mainland and its vicinity is divided into subregions and 20 units. By using the earthquake (Ms6.0) catalogue of the latest 100 years for the continental region, the strain energy released by earthquakes in each unit and each subregion is calculated. And the curves of the strain energy released by earthquakes changing with time are drawn after slip averaged by time. They indicate that:(a) the released energy of earthquakes in each subregion is characterized by undulation with alternating high and low points and by multi-phases; (b) the active or quiet period is not absolute but relative; (c) it demonstrates that the division of the micro-dynamic periods for seismicity is appropriate. By further analyzing, considering that there are three main factors that affect the change and migration of the major subregions of great earthquakes, they are as follows:(1) movement and its change of the India plate, the Pacific plate and the Philippine plate controls the basic pattern of strong earthquakes in the China's continent and its vicinity. Earthquakes and tectonic movement along the plate boundaries change with time in an uneven manner. Even along the same plate boundary, activity of each section is different from each other;(2) the heterogeneity of the continental crust has effect upon the structure of the major seismic subregions; (3) the inheritance of crust deformation affects the process of formation and migration of the major seismic subregions.
【Fund】: 国家重点基础研究项目(G199804070405);; “九五”国家地震局攻关项目(95040701)
【CateGory Index】: P315.5
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