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A method calculating relative shear stress values in seismic source areas using data of seismic wave is used in this paper which is introduced by Pei-Shan CHEN, based on a rupture model studying seismic rupture process from theory of fracture mechanics. The shear stress values τ0 in mid-small earthquakes occurred in 1986–June of 1997 in Yunnan and its adjacent areas are used to trace the variation...
By means of the hypocenter distribution and focal mechanism of Wuding MS=6.5 earthquake sequence occurred in 1995, the space orientation and activity characteristics of focal fault of Wuding earthquake have been studied from the three-dimensional space-time process. The results indicate that the focal fault of Wuding earthquake is a subsurface, NWW-trending, upright and right-lateral strike slip...
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