基于空间插值方法的2021年云南漾濞M_(S)6.4地震仪器地震烈度影响场分析  

Analysis of the Influence Field of the Instrumental Seismic Intensity of the 2021 Yangbi, Yunnan M_(S)6.4 Earthquake Based on Spatial Interpolation Method

作　　者：于江[1] 和仕芳 卢永坤[1] 庞卫东[1] 罗伟东[1] 钟玉盛 YU Jiang;HE Shifang;LU Yongkun;PANG Weidong;LUO Weidong;ZHONG Yusheng(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

机构地区：[1]云南省地震局,云南昆明650224

出　　处：《地震研究》2021年第3期414-421,共8页Journal of Seismological Research

基　　金：云南省地震局科技专项(ZX2016-04);云南省地震局漾濞地震专项(2021YBZX14);云南省地震局科技专项(2018ZX02)联合资助。

摘　　要：基于2021年云南漾濞M_(S)6.4主震预警台网地震动数据,使用多种空间插值方法探讨获得最优仪器地震烈度影响场,并与宏观地震烈度调查结果进行对比分析。结果表明:基于指数模型变异函数的普通克里金插值法获得的仪器地震烈度影响场与宏观地震烈度具有较好的一致性,能够反映实际地震烈度空间总体影响场范围及特征;除了两者因概念和属性不同而造成的影响场差异之外,台站分布、场地条件、空间插值方法、前震和余震震害叠加等因素也是导致本次地震影响场差异的主要原因。Based on the ground motion data of the Yangbi M_(S)6.4 earthquake recorded by the Yunnan Early Warning Network,a variety of spatial interpolation methods are used to obtain the optimal instrumental intensity influence field,and compared with the results from the macroscopic intensity obtained from field survey.The results show that the influence field of instrumental intensity obtained by the ordinary Kriging interpolation method based on the variogram of the exponential model has a good agreement with the macroscopic seismic intensity,which can reflect the overall range of the influence field and characteristics of the actual seismic intensity.The main reasons for the differences between the instrumental intensity influence field and the macroscopic intensity field are the distribution of stations,site conditions,spatial interpolation methods,and the superposition of foreshocks’damage and aftershocks’damage.

关 键 词：仪器烈度 地震烈度 空间插值 预警台网 漾濞M_(S)6.4地震 

分 类 号：P315.9[天文地球—地震学]