Analysis of the Regional Characteristics of Seismic Intensity Attenuation Relationships in Sichuan

Using the intensity data of historical destructive earthquakes in Sichuan such as the 2008 Wenchuan earthquake, the Lushan earthquake, and the Jiuzhaigou earthquake, according to the statistical relationship of each seismic center intensity, magnitude, and radius of each intensity circle, this paper established attenuation relationships of the seismic intensity along the long axis, the short axis, and the average axis. Combining the regional seismotectonic characteristics and previous research results, the seismic intensity attenuation relationships have regional characteristics in the high mountains of northwest Sichuan, the Sichuan Basin and surrounding areas, the Southern Sichuan to the Sichuan–Yunnan junction, and the surrounding areas of the Xianshuihe fault. The result of this paper can be used in the practice of rapid assessment of the impact and loss of earthquake disasters.