STUDY ON INTENSITY ATTENUATION RELATIONSHIP OF WUSHI MS7.1 EARTHQUAKE
Using 131 destructive seismic events with intensity data,a total of 322 pairs of long and short axis data of intensity circle,the attenuation relationship of seismic intensity in different regions of Xinjiang is fitted by mathematical method.The seismic intensity attenuation models used in Xin-jiang region are collected and sorted out.The long and short axis radii of each intensity zone of Wushi MS7.1 earthquake on January 23,2024 are simulated and calculated by using the model,and the absolute error analysis is carried out with the long and short axis radii of the actual survey inten-sity.The high intensity area of this earthquake is more than 40％larger than the high intensity area of the same magnitude in the past.The calculation results in the Ⅶ degree area are the closest to the actual value.The error in the long axis direction of the Ⅵ degree area is small,and the error in the short axis direction of the Ⅵ degree area is large.The intensity attenuation relationship used in the past may have a small epicenter distance in the high intensity area,and there is a large epicenter distance in the low intensity area.Therefore,when the intensity attenuation relationship is used to quickly evaluate the intensity impact field of earthquake disasters,special attention should be paid to the method of limiting the head and tail of the attenuation relationship to more accurately evaluate.
万方数据
维普
