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This paper calculates the static stress changes generated by the Yushu M_S 7. 1 earthquake in Qinghai Province. On the basis of regional stress,we take account of the static stress change triggered by the Yushu M_S 7. 1 earthquake to find the optimally oriented fault planes,then calculate the Coulomb stress change on the optimally oriented fault plane. The results indicate that most of the aftershocks are triggered by the mainshock. The image of Coulomb stress changes is also in accord with regional earthquakes ( M_L ≥3. 0 ) distribution,but the value is lower than 0. 01MPa. In addition,this paper calculates the Coulomb stress changes in the case that the aftershock fault plane is the same as the main shock. Through comparison,we find that the image of Coulomb stress changes obtained using the “optimally oriented fault”approach is more consistent with the distribution of Yushu aftershocks and regional earthquakes.
This paper calculates the static stress changes generated by the Yushu M_S 7. 1 earthquake in Qinghai Province. On the basis of regional stress, we take account of the static stress change triggered by the Yushu M_S 7. 1 earthquake to find the optimally oriented fault The results of the Coulomb stress change on the optimally oriented fault plane. The results indicate that most of the aftershocks are triggered by the mainshock. The image of Coulomb stress changes is also in accord with regional earthquakes (M_L ≥3. 0) distribution , but the value is lower than 0. 01MPa. In addition, this paper calculates the Coulomb stress changes in the case that the aftershock fault plane is the same as the main shock. Through comparison, we find that the image of Coulomb stress changes obtained using the “optimally oriented fault ” approach is more consistent with the distribution of Yushu aftershocks and regional earthquakes.