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Title:: Damage and Intensity Assessment of Buildings in the 2021 Yangbi,Yunnan M_S6.4 Earthquake Area

Author(s):: YANG Jianqiang; YE Yang; LU Yongkun; LIU Shaochang; YU Jiang; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: the Yangbi M_S6.4 earthquake; building damage; intensity evaluation; the average earthquake-damage index

摘要:: 根据云南省漾濞县M_S6.4地震现场调查资料,详细阐述了本次地震的烈度分布和房屋震害,计算给出各烈度区各类房屋结构的平均震害指数,并与《中国地震烈度表》和2014年云南鲁甸6.5级、景谷6.6级地震进行了对比分析。结果表明:①漾濞地震灾区土木结构和框架结构房屋的震害现象较为明显,砖混结构房屋震害较轻,而砖木结构房屋因数量较少,没有调查到太多的震害现象; ②各烈度区各类房屋平均震害指数与烈度对应关系良好,表明本次地震烈度评定结果符合国家标准和云南地区地震烈度分布规律; ③对比分析云南省两次震级相近地震的各类房屋平均震害指数,发现本次地震房屋震害整体偏轻。

Abstract:: According to the field survey of the M_S6.4 earthquake in Yangbi County,Yunnan Province,the intensity distribution and buildings' damage caused by this earthquake are elaborated,and the average hazard index of various building structures in each intensity area is calculated and compared with the China Earthquake Intensity Table.Further,a comparative analysis of the buildings' damage was carried out with the aid of the buildings' damage by the Ludian M_S6.5 earthquake and the Jinggu M_S6.6 earthquake in Yunnan in 2014.The results show:① The damage to civil-structure houses and frame-structure houses in the disaster area in Yangbi is obvious.The damage to brick-concrete structure houses is relatively light.The brick-wood structure houses is few,so a little earthquake damage has been found; ② In each intensity area,the average hazard indexes of houses are in good accordance with and the intensity,indicating that the seismic intensity evaluation of this earthquake conforms to the national standards and complies with the distribution law of the earthquake intensity in Yunnan; ③ Compared with the average damage index of the houses in the other two earthquake events in Yunnan,it is concluded that the overall damage in this Yangbi M_S6.4 earthquake event was relatively light.