COMPARATIVE STUDY ON BUILDING DAMAGE CAUSED BY THE 2025 MS6.8 EARTHQUAKE IN DINGRI, XIZANG, BASED ON REMOTE SENSING AND SEISMIC SIMULATION

doi:10.3969/j.issn.0253-4967.2025.03.20250019

SEISMOLOGY AND GEOLOGY ›› 2025, Vol. 47 ›› Issue (3): 932-948.DOI: 10.3969/j.issn.0253-4967.2025.03.20250019

COMPARATIVE STUDY ON BUILDING DAMAGE CAUSED BY THE 2025 M_S6.8 EARTHQUAKE IN DINGRI, XIZANG, BASED ON REMOTE SENSING AND SEISMIC SIMULATION

YUAN Xiao-xiang¹^,²⁾(), LIN Xu-chuan¹⁾^,^*(), CHEN Zi-feng¹⁾, ZHANG Jian-long³⁾, DOU Ai-xia²⁾, XIAO Ben-fu⁴⁾, DU Hao-guo⁵⁾, YU Si-han⁶⁾, DING Xiang²⁾, FANG Jie¹^,⁷⁾, WANG Shu-min²⁾

1)Key Laboratory of Earthquake Disaster Mitigation,Institute of Engineering Mechanics, China Earthquake Administration, Ministry of Emergency Management, Key Laboratory of Earthquake Engineering and Engineering Vibration, Harbin 150080, China
2)Key Laboratory of Earthquake Prediction and Risk Assessment Emergency Management Department, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
3)Earthquake Agency of Xizang Autonomous Region, Lhsa 850000, China
4)Sichuan Earthquake Agency, Chengdu 610041, China
5)Yunnan Earthquake Agency, Kunming 650224, China
6)Earthquake Agency of Ningxia Hui Autonomous Region, Yingchuan 750001, China
7)Wuhan Institute of Earthquake Engineering Co., Ltd., Institute of Seismology, China Earthquake Administration, Wuhan 430060, China

Received:2025-01-24 Revised:2025-03-20 Online:2025-06-20 Published:2025-08-13

基于遥感和震害仿真的2025年西藏定日6.8级地震建筑物震害对比

袁小祥¹^,²⁾(), 林旭川¹⁾^,^*(), 陈子峰¹⁾, 张建龙³⁾, 窦爱霞²⁾, 肖本夫⁴⁾, 杜浩国⁵⁾, 余思汗⁶⁾, 丁香²⁾, 方杰¹^,⁷⁾, 王书民²⁾

1)中国地震局工程力学研究所, 地震灾害防治应急管理部重点实验室, 中国地震局地震工程与工程振动重点实验室, 哈尔滨 150080
2)中国地震局地震预测研究所, 地震预测与风险评估应急管理部重点实验室, 北京 100036
3)西藏自治区地震局, 拉萨 850000
4)四川省地震局, 成都 610041
5)云南地震局, 昆明 650224
6)宁夏回族自治区地震局, 银川 750001
7)中国地震局地震研究所, 武汉地震工程研究院有限公司, 武汉 430060

通讯作者: *林旭川, 男, 1984年生, 研究员, 主要从事结构工程抗震、区域地震灾害模拟等领域研究, E-mail: linxuchuan@iem.ac.cn。
作者简介:
袁小祥, 男, 1983年生, 现为中国地震局工程力学研究所结构工程方向在读博士研究生, 副研究员, 主要从事基于多源空间信息的地震灾害信息提取、震害仿真与地震灾害风险评估等研究, E-mail: yuanxx@ief.ac.cn。
基金资助:
宁夏重点研发计划重点项目(2024BEG02033); 国家自然科学基金(42271090); 应急管理部重点科技计划项目(2024EMST050503); 中国地震局地震预测研究所地震业务科技支撑项目(CEAIEF20240508)

Abstract

Abstract:

Building damage caused by the earthquake is a significant factor contributing to fatalities in destructive earthquakes. Accurate assessment results of building damage after earthquakes are of great significance for revealing the mechanism of building damage under destructive earthquakes, guiding the research and development of seismic reinforcement technology and post-disaster recovery and reconstruction. On January 7, 2025, the Dingri M6.8 earthquake in Tibet caused many building damages and casualties. To quickly evaluate the seismic damage of buildings in this earthquake and improve the scientificity and timeliness of various methods for assessing seismic damage in the emergency stage, a comparative study on the seismic damage of buildings in this earthquake was conducted based on remote sensing and seismic damage simulation.

Firstly, the GF-2 remote sensing images and Beijing -3 images obtained on January 8, 2025, were quickly collected as the input of remote sensing building seismic damage information extraction. The GF-2 remote sensing images, collected from October 2024, and actual strong ground motion data from the two nearest stations were used for seismic damage simulation prior to the earthquake. Based on data preprocessing, the physical models of the buildings in the disaster area were quickly extracted using a combination of deep learning and human-computer interaction from pre-earthquake remote sensing images.

Then, based on constructing the remote sensing structure type characteristics and seismic damage interpretation characteristics of typical buildings, combined with some risk census data and a small amount of field survey information, the physical models of buildings in the study area were adjusted and optimized, and the data obtained on site were used for verification. Based on this information and post-earthquake images, the rapid identification of building seismic damage was carried out using optical remote sensing. At the same time, based on the data from two measured strong earthquake stations, the rapid simulation of earthquake damage was carried out by using the urban seismic simulator(YouSimulator).

Taking the residential area as the statistical unit, the remote sensing seismic damage index was calculated for the quickly acquired remote sensing building seismic damage. According to the regional approximation principle, the corresponding model was used to calculate the ground equivalent seismic damage index, and the remote sensing intensity was estimated. Referring to the seismic intensity evaluation standard, the intensity of the seismic damage simulation results was calculated. Finally, the results of different methods were compared with the formal intensity.

The findings indicate that most buildings in the disaster area are dispersed along rivers and valleys in the form of zonal distribution, exhibiting a small but relatively concentrated at some local spatial locations. The structural types are predominantly civil and stone-wood structures, which exhibit pronounced vulnerability under this earthquake. The two methods demonstrated a certain degree of consistency in identifying buildings with high seismic damage ratings in intensity zones above Ⅷ, with an overall assessment error of less than 1 degree. However, in zones Ⅶ and below area, there was a specific error in the evaluation results. This observation indicates that, in the aftermath of a major seismic event, both methods can contribute to emergency response efforts at various stages post-event by providing rapid building damage assessment results, thereby serving as scientific references for earthquake emergency relief and disaster reduction.

Key words: Dingri earthquake, earthquake damage of buildings, remote sensing images, seismic simulation, rapid assessment

摘要： 建筑物震害是破坏性地震人员致死的重要因素, 震后快速、及时获取有效的建筑物震害评估结果对应急救灾、灾情评估及结构抗震意义重大。文中以2025年1月7日西藏定日6.8级地震为例, 首先基于震前遥感影像进行灾区建筑物单体物理模型快速提取。然后在构建典型建筑物遥感解译特征的基础上, 对灾区建筑物分别开展了基于光学遥感和震害仿真方法的震害快速识别。最后, 对快速获取的建筑物震害信息进行定量评估, 并将不同方法产出的结果与发布烈度进行了对比分析。结果显示, 空间上灾区建筑物主要沿河流和山谷呈散落带状分布, 局部空间分布规模较小但相对集中, 结构类型以土木和石木结构为主, 此类建筑在地震中表现出显著的易损性。2种方法在Ⅷ度以上烈度区识别高震害等级建筑物时, 总体评估误差在1度以内; 而对于Ⅶ度及以下区域, 评估结果则存在一定误差。研究表明, 强烈地震发生后, 借助不同方法可针对震后不同阶段的应急需求发挥作用, 快速提供建筑物震害评估结果, 为地震应急救灾和减灾提供科学参考。

关键词: 定日地震, 建筑物震害, 遥感影像, 震害仿真, 快速评估

YUAN Xiao-xiang, LIN Xu-chuan, CHEN Zi-feng, ZHANG Jian-long, DOU Ai-xia, XIAO Ben-fu, DU Hao-guo, YU Si-han, DING Xiang, FANG Jie, WANG Shu-min. COMPARATIVE STUDY ON BUILDING DAMAGE CAUSED BY THE 2025 M_S6.8 EARTHQUAKE IN DINGRI, XIZANG, BASED ON REMOTE SENSING AND SEISMIC SIMULATION[J]. SEISMOLOGY AND GEOLOGY, 2025, 47(3): 932-948.

袁小祥, 林旭川, 陈子峰, 张建龙, 窦爱霞, 肖本夫, 杜浩国, 余思汗, 丁香, 方杰, 王书民. 基于遥感和震害仿真的2025年西藏定日6.8级地震建筑物震害对比[J]. 地震地质, 2025, 47(3): 932-948.

Figures/Tables 10

Fig. 1 Overview map of the study area in the Dingri MS6.8 earthquake.

Fig. 2 Workflow of seismic damage extraction based on remote sensing and seismic hazard simulation.

Fig. 3 Building seismic damage simulation methods(adapted from LIN Xu-chuan, 2017; Lin et al., 2024).

Fig. 4 Visualization of seismic damage interpretation indicators based on remote sensing images.

Fig. 5 Distribution of visualized earthquake damage extraction results for typical scenarios in the study area.

Fig. 6 Local seismic building damages in the severely affected area.

Fig. 7 Comparative analysis of seismic building damage in representative local areas of Changsuo Town.

Table 1 Result comparison between rapid remote sensing seismic damage identification and seismic damage simulation in percentage

震害类别	震害仿真(D0004/D0007)
遥感	毁坏	严重破坏	中等破坏	轻微破坏	基本完好
倒塌	0.0/11.9	11.9/0.0	0.0/0.0	0.1/0.1	0.0/0.0
局部倒塌	0.0/17.9	17.9/0.0	0.0/0.1	0.3/0.2	0.0/0.0
未倒塌	0.0/66.7	66.7/0.1	0.0/1.4	1.9/1.7	1.2/0.0

Fig. 8 Comparison of quantitative assessment results of seismic damage to typical residential buildings.

Table2 Comparative analysis between assessed intensity from different methods and official released intensity in residential settlements

评估烈度		遥感评估结果			D0004仿真结果			D0007仿真结果
评估烈度		Ⅹ度	Ⅸ度	Ⅷ度	Ⅸ度	Ⅷ度	Ⅶ度	Ⅸ度	Ⅷ度	Ⅶ度
居民点对应发布烈度	Ⅸ度	1	1		1	1		2
	Ⅷ度		1	1		2		2
	Ⅶ度			3		8	2	9	1
	Ⅵ度					1	1	1	1

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COMPARATIVE STUDY ON BUILDING DAMAGE CAUSED BY THE 2025 M_S6.8 EARTHQUAKE IN DINGRI, XIZANG, BASED ON REMOTE SENSING AND SEISMIC SIMULATION

基于遥感和震害仿真的2025年西藏定日6.8级地震建筑物震害对比

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