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《Journal of Yunnan University (Natural Sciences)》 2001-04
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Tidal Stress and Earthquakes in Yunnan and Its Neighbor Area

WU Xiao ping 1,3 , HUANG Yong 2, MAO Wei 3, KANG Guo fa 1 (1.Earth Science Department,Yunnan University,Kunming 650091,China; 2.Seismological Bureau of Yunnan Province,Kunming 650041,China; 3.Yunnan Observatory,The Chinese Academy of Sciences,  
The mechanical modal of tidal stress effects on seismic faults is proposed.The ways of mechanical effects on seismic faults by tidal stress components is described.The modal is applied to the earthquakes of Yunnan and its neighbor area.Tidal stress components along P axis and T axis of 173 earthquake focuses are calculated.Patterns of tidal stress effect on the earthquake faults and the types of seismic fault under slip accelerating effect of tidal stress are analyzed.The results indicate that the proportion of the numbers of seismic faults affected by slip accelerating effect of tidal stress is 64% of the 173 earthquakes;Proportion of the numbers of seismic faults affected by the compression reducing type is slightly larger than that affected by the compression adding type;Among 111 seismic faults which is affected by slip accelerating effect,the proportion of strike slip faults is 67% and the proportion of dip oblique slip faults is 33%.This shows that the earthquakes of strike slip type are more liable to be triggered by tidal stress.
【CateGory Index】: P315.75
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