Abstract:The 1966 Xingtai earthquake devastated densely populated areas. There were a total of five MS≥6.0 earthquakes in 21 days. Many studies have shown that there was intense magmatism under the area. Analysis of the static Coulomb stress triggering of the five earthquakes shows that the triggering of the first two earthquakes had good relations, but that the relations after the MS7.2 earthquake triggering were not ideal. This paper argues that, as the earthquakes occurred, the focal depth increases, the impact on the crust magmatism grows, and the elastic properties of crustal medium weakens. The shallow part of the region can be approximated with homogeneous elastic half-space. However, for the deeper part, under the influence of magma and other factors, there is a big error in calculation of earthquake triggering with homogeneous elastic half-space. This is not suitable for calculating the earthquake triggered by the elastic dislocation theory. Furthermore, this also reflects the regional magmatic activity and the objectivity of the existence of the super crust fault.
LI Shouyong,ZOU Liye,SUN Qing et al. Analysis and Discussion of the Static Coulomb Stress Triggering of the 1966 Xingtai Earthquake[J]. jgg, 2016, 36(10): 918-921.