Abstract:We calculate the Coulomb failure stress change caused by the 2008 Wenchuan earthquake by choosing model parameters, such as the 2008 Wenchuan earthquake rupture models, the fault parameters of 2017 Jiuzhaigou earthquake, and the effective friction coefficient. Our results show that the sum of co-seismic and post-seismic Coulomb stress change until 2017 is about 3~7 kPa at the epicenter of the Jiuzhaigou earthquake, which is less than the triggering threshold (10 kPa). The 2008 Wenchuan earthquake might have promoted the 2017 Jiuzhaigou earthquake to some degree. However, the triggering is not the main cause of the occurrence of the 2017 Jiuzhaigou earthquake. By analyzing the stress results from the models with various model parameters, we find that the rupture model of 2008 Wenchuan earthquake has the greatest impact on the results. Using a different rupture model of the 2008 Wenchuan earthquake might be the main reason for the different results from previous studies.