Rapid estimation of disaster losses for the M6.8 Luding earthquake on September 5,2022  

作　　者：Wenqiang WANG Yilong LI Zhenguo ZHANG Danhua XIN Zhongqiu HE Wei ZHANG Xiaofei CHEN 

机构地区：[1]Department of Astronautical Science and Mechanics,Harbin Institute of Technology,Harbin 150001,China [2]Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,China [3]Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Science China Earth Sciences》2023年第6期1334-1344,共11页中国科学（地球科学英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2020YFB0204701);the National Natural Science Foundation of China(Grant Nos.41922024&42204054);the Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology(Grant No.2022B1212010002).

摘　　要：An M6.8 earthquake occurred in Luding,Sichuan Province,China,on September 5,2022.Since towns and villages in the earthquake-stricken area are densely populated,the earthquake caused severe fatalities and economic losses.Rapid estimation of earthquake intensity and disaster losses is significantly important for post-earthquake emergency rescue,scientific anti-seismic deployment,and the reduction of casualties and economic losses.Therefore,we make a preliminary rapid estimation of the earthquake intensity and disaster losses in the aftermath of the Luding earthquake.The seismic intensity represents the distribution of earthquake disasters and the degree of ground damage and can be directly converted from the peak ground velocity(PGV)map.To obtain a reliable PGV distribution map of this earthquake,we combined the finite-fault model constrained by seismic observations,with the complex three-dimensional(3D)geological environment and topographical features to perform strong ground motion simulation.Then,we compared the consistency between the simulated ground motion waveforms and observations,indicating the plausibility and reliability of simulations.In addition,we transformed the PGV simulation results into intensity and obtained a physics-based map of the intensity distribution of the Luding earthquake.The maximum simulated intensity of this earthquake is IX,which is consistent with the maximum intensity determined from the postearthquake field survey.Based on the simulated seismic intensity map of the Luding earthquake and the earthquake disaster loss estimation model,we rapidly estimated the death and economic losses caused by this earthquake.The estimated results show that the death toll caused by this earthquake is probably 50-300,with a mathematic expectation of 89.Thus the government should launch a Level II earthquake emergency response plan.The economic losses are likely to be 10-100 billion RMB,with a mathematical expectation of 23.205 billion RMB.Such seismic intensity simulations and rapid estimation of di

关 键 词：Luding earthquake Ground motion simulation Seismic intensity Estimation of disaster losses FATALITY Economic losses 

分 类 号：P315.9[天文地球—地震学]