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Title:: Investigation of Typical Earthquake-damage Caused by the 2021 Yangbi,Yunnan M_S6.4 Earthquake Based on the Oblique Photography

Author(s):: ZHANG Fanghao; DU Haoguo; ZHANG Yuanshuo; ZHANG Jianguo; LU Yongkun; CAO Yanbo; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: earthquake-damage investigation; oblique photography; high yesolution; the Yangbi 6.4 earthquake

摘要:: 倾斜摄影建立的高分辨率三维模型,能够呈现建筑物立体视觉效果,便于对建筑物结构、墙体、门窗等详细破坏情况进行分析,弥补了传统遥感影像只能获取建筑物顶部信息的局限。2021年5月21日漾濞M_S6.4地震发生后,利用多旋翼无人机、采用倾斜摄影的方式拍摄了Ⅷ度区的苍山西镇花椒园村背阴坡小组建筑物多个角度影像,建模生成高分辨率三维模型,并对破坏最严重的某户民居的破坏情况和原因进行了分析,认为造成破坏加重的不利因素有:山体的放大效应、边坡的放大效应、多次地震震害叠加效应以及建筑墙体自身缺陷。

Abstract:: The high-resolution 3D model created on the basis of the oblique photography is able to present stereovision effect of buildings,which facilitates analyzing the damages of structures,walls,doors,windows,etc.The 3D model improves the traditional remote sensing images that can only obtain information of the roof of buildings.In the disastrous area in Yangbi County stricken by the 6.4-magnitude earthquake on May 21,2021,we used multi-rotor drones to take photos of the residential houses in Beiyinpo villagers' group in Huajiaoyuan Village,West Cangshan Town which located on the seismic Intensity 7 area.Further,we set up high-resolution 3D models,and on the basis of our models,we analyzed the cause of the most severely damaged residential houses of a family in the Beiyinpo villagers' group.Thus,we identified several unfavorable factors that caused the aggravation of the damage to the houses:the magnifying effect of mountains,the amplification effect of the slope,the superimposition of multiple earthquake damage,and the defects of the buildings' walls.