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《Journal of Geodesy and Geodynamics》 2006-02
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RESEARCHES ON RELATIONS AMONG EARTH ROTATION, FAULT DEFORMATION AND SEISMICITY

Bo Wanju1) and Wang Guangyu2) 1)First Crust Monitoring and Application Center, CEA, Tianjin 300180 2)China Center for Earthquake Disaster Emergency and SAR, Beijing 100039  
The variations of earth rotation, fault deformation and seismicity have been studied and the relations among them are analyzed. Some new results are given here: 1) The variation of the earth rotation speed is correlated with the crust deformation. There is an approximately 10-year period variation in recent 30 years, but the correlative component between them in the whole deformation is small, showing a weak relation; 2)When the speed of earth rotation is slowing, the length of day is lengthening, and the earthquakes in North China are active.Consequantly, it is not a seismicity period in North China at present; 3)The medium-and short-term precursor can be shown in fault deformation data, but it can’t be shown in the earth rotation data for a certain earthquake. 4) The relationship between the earth rotation and the deformation is an isogenous, not a consequent, and they compensat each other. 5) In North China, the recent two seismicity periods are correlated with the 10-year or longer period of the earth rotational variation, so there is a certain relation between seismicity and the earth rotation in this region, but the relations are different in different area. Because the couplings between crust and the earth mantle are different in different region, the same variation of earth rotation must induce different crust activities.
【Fund】: 中国地震局十五项目(10-5-08-06)
【CateGory Index】: P315.725
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