2022年云南宁蒗MS 5.5地震房屋震害特征与烈度评定

根据2022年云南宁蒗M_S 5.5地震现场调查情况，详细描述本次地震的烈度分布情况和房屋震害特征，计算各烈度区内各类房屋结构的平均震害指数和破坏比，与2012年宁蒗—盐源M_S 5.7地震和历史地震震害统计规律进行对比，结果表明： ①本次地震最大烈度为Ⅶ度，长轴呈NW向，与地震构造背景、震源机制解、余震序列分布和震例统计规律等科技支撑成果吻合较好； ②本次地震中房屋震害较轻，主要得益于脱贫攻坚、农村危房改造和抗震改造等项目的实施，震区房屋结构的整体抗震性能加强。

Building seismic damage characteristics and intensity evaluation of Yunnan Ninglang MS 5.5 earthquake in 2022

According to the on-site investigation of the M_S 5.5 earthquake in Ninglang County, Yunnan Province in 2022, the intensity distribution and house damage characteristics of this earthquake are described in detail, the average seismic damage index and damage ratio of various house structures are calculated, and the comparative analysis with the statistical law of the intensity of historical earthquakes and the 2012 Ninglang-Yanyuan M_S 5.7 earthquake is carried out. The results show that: ① The maximal intensity of this earthquake is Ⅶ, and shapes of isoseismic lines are oval with a long axis in NW direction, which is in good accordance with the seismic tectonic background, focal mechanism solution, aftershock sequence distribution, and statistical laws of earthquakes; ② The earthquake damage to the houses is relatively light, which is mainly because that the poverty alleviation, rural dilapidated house renovation, seismic reconstruction, and other projects have strengthened the overall seismic performance of building structures in earthquake areas.