2023年云南省保山市隆阳M_(S)5.2地震震害特征  

Characteristics of earthquake damage caused by the 2023 M_(S)5.2 earthquake in Longyang District,Baoshan City,Yunnan Province

作　　者：刘绍昌 叶阳 LIU Shaochang;YE Yang(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：《地震工程学报》2025年第3期652-662,679,共12页China Earthquake Engineering Journal

摘　　要：2023年5月2日云南省保山市隆阳区(24.91°N,99.26°E)发生M_(S)5.2地震,打破了保山市2015年以来未发生5.0级以上地震的平静。基于本次地震现场灾害损失调查和灾情资料的收集整理,对隆阳区M_(S)5.2地震震区的发震构造、震源机制、地震烈度空间分布、房屋建筑、工程结构震害特征及原因分析进行详细阐述,给出灾区房屋建筑震害矩阵,并与云南省相近震级历史地震震害特征进行对比分析。结果表明:隆阳区M_(S)5.2地震震中位于澜沧江断裂带中段,断裂带运动性质为右旋走滑,与震源机制解得到的结果相一致,均为走滑型破裂类型。地震灾区最高烈度为Ⅵ度,受灾面积约为600 km^(2),烈度圈呈不规则椭圆状,长轴长37 km,短轴长21 km,等震线长轴方向为NNW向,与澜沧江断裂走向一致。本次地震造成了9人轻伤,与云南省同级别历史地震相比受伤人数偏多;在房屋建筑中,土木结构房屋抗震性能差,受损相对严重,瓦窑镇政府所在地由于场地效应和部分砖混结构、框架结构房屋未按规范施工,抗震性能不达标,使部分房屋受损达到Ⅶ度破坏;工程结构设施中的交通、通信、水利设施不同程度受损,其中交通设施受损相对较严重。基于本次地震受灾范围广,受伤人数多,房屋建筑破坏与经济损失重的震害特征,提出相应的应急处置建议,对提高滇西地区防震减灾、应急救援能力提供参考依据。An M_(S)5.2 earthquake occurred in Longyang District(24.91°N,99.26°E),Baoshan City,Yunnan Province,on May 2,2023,disrupting the relative seismic calm in Baoshan City,which had not experienced any M_(S)≥5.0 earthquakes since 2015.Based on field investigations of disaster losses and the collection of disaster data,this study provides a detailed analysis of the seismogenic geological structure,focal mechanism,spatial distribution of seismic intensity,and the earthquake damage characteristics and causes in buildings and engineering structures in the Longyang area.Additionally,the earthquake damage matrix for buildings in the affected area was compared with the damage characteristics of historical earthquakes of similar magnitude in Yunnan Province.Results show that the epicenter of Longyang M_(S)5.2 earthquake is located in the middle segment of the Lancang River fault zone,with right-lateral strike-slip,which is consistent with the result of the focal mechanism solution.The maximum intensity is Ⅵ degree,and the affected area is approximately 600 km^(2).The intensity circle presents an irregular ellipse with a long axis of 37 km and a short axis of 21 km.The long axis direction of the isoseismic line is NNW,aligning with the strike of the Lancang River fault,which is closest to the epicenter of the earthquake.Nine people were slightly injured in the earthquake,a number higher than typically seen in historical earthquakes of similar magnitude in Yunnan Province.The seismic performance of civil structure houses was poor,with notable damage observed.Due to site effects and the fact that some brick-concrete and frame structures were not constructed in accordance with specifications,the damage to houses in the area where the Wayao Town Government is located reached a severity level of Ⅶ.Traffic,communication,and water conservancy facilities were damaged to different degrees,with traffic infrastructure suffering the most severe damage.Given the extensive damage,high casualties,serious building destruction,and signi

关 键 词：隆阳M_(S)5.2地震 震害特征 震害成因 

分 类 号：P315.94[天文地球—地震学]