基于空间插值方法的2020年唐山古冶MS5.1地震仪器烈度影响场分析OA

On July 12,2020,an MS5.1 earthquake occurred in Guye District,Tangshan City,Hebei Province.We selected strong-motion and intensity observation data from 363 seismic stations(including 207 strong-motion and 156 intensity stations)to conduct the study.After preprocessing steps such as instrument performance verification,baseline correction,and digital filtering,the accuracy of extracting key parameters,including peak ground acceleration(PGA)and peak ground velocity(PGV),improved significantly.By employing spatial interpolation methods,we systematically analyzed the technical path and effect of the seismic instrument intensity influence field.Through comparative analysis of the application effects of the inverse distance weighting method(IDW)and ordinary kriging(OK)in the estimation of seismic intensity distribution,it was found that the IDW method can quickly capture the violent changes in seismic motion in areas with dense station networks,but it is susceptible to uneven data distribution.The ordinary kriging method,by quantifying spatial autocorrelation,exhibits higher accuracy and stability in scenarios with uneven data or complex spatial structures,and its interpolation results are more consistent with those of a macroscopic seismic intensity survey.This study provides a scientific basis for rapid earthquake disaster assessment and suggests that the two methods can be applied together to enhance analysis efficiency and accuracy in seismic intensity assessment.