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Landslides Triggered by the 3 August 2014 ludian(China) Mw 6.2 earthquake: An Updated Inventory and Analysis of Their Spatial Distribution

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Journal of Earth Science 2020年第4期31卷 853-866页

作者： Weiying Wu Chong Xu Xiaoqing Wang Yingying Tian Fei Deng Institute of earthquake Forecastings China earthquake Administration Beijing 100036China Institute of Crustal Dynamics China Earthquake AdministrationBeijing 100085China Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake AdministrationBeijing 100029China

The 3 August 2014 ludian, Yunnan, China Mw 6.2(Ms 6.5) earthquake triggered a large number of coseismic landslides. Based on pre-and post-quake high-resolution optical satellite images, this study established a new, complete and objective database of these landslides with field investigations. The updated inventory shows that this earthquake triggered at least 12 817 landslides with a total occupation area of 16.33 km2, covering a nearly circular area about 600 km2, which all exceed those in our previous work and other relevant studies. In addition, we used this database to examine the correlations of the landslides with topographic, geologic, and seismic factors. Results show that the landslides occurred mostly at places with slope gradients 10o–40o, showing an increase tendency with steeper slopes. Affected by the propagation direction of the earthquake rupture, the eastward-facing slopes are more prone to landsliding. The differences between the landslide susceptibility in different strata indicate that lithology is also an important controlling factor. The landslide density of the places with peak ground acceleration(PGA) greater than 0.16 g is obviously larger than those with PGA less than 0.16 g. Meanwhile, the greater the distance from the epicenter, the lower the susceptibility of landslides is. This study suggests that when using satellite images to create coseismic landslide inventories, it should meet certain conditions, including high resolution, whole coverage, and timely data collection. The correct criteria of coseismic landslide inventorying also should be followed. Such inventories can provide a reliable basis for hazard assessment of earthquake-triggered landslides and other quantitative studies.

关键词： 2014 ludian earthquake coseismic landslides landslide inventory spatial distribution

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Regional seismic-damage prediction of buildings under mainshock-aftershock sequence

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Frontiers of Engineering Management 2021年第1期8卷 122-134页

作者： Xinzheng LU Qingle CHENG Zhen XU Chen XIONG Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil EngineeringTsinghua UniversityBeijing 100084China Beijing Engineering Research Center of Steel and Concrete Composite Structures.Tsinghua University Beijing 100084China Beijing Key Laboratory of Urban Underground Space Engineering School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing 100083China Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering Shenzhen UniversityShenzhen 518060China

Strong aftershocks generally occur following a significant *** further damage buildings weakened by ***,the accurate and efficient prediction of aftershock-induced damage to buildings on a regional scale is crucial for decision making for post-earthquake rescue and emergency response.A framework to predict regional seismic damage of buildings under a mainshock-aftershock(MS-AS)sequence is proposed in this study based on city-scale nonlinear time-history analysis(THA).Specifically,an MS-AS sequence-generation method is proposed to generate a potential MS-AS sequence that can account for the amplification,spectrum,duration,magnitude,and site condition of a target ***,city-scale nonlinear THA is adopted to predict building seismic damage subjected to MS-AS *** accuracy and reliability of city-scale nonlinear THA for an MS-AS sequence are validated by as-recorded seismic responses of buildings and simulation results in published *** town of Longtoushan,which was damaged during the ludian earthquake,is used as a case study to illustrate the detailed procedure and advantages of the proposed *** primary conclusions are as follows.(1)Regional seismic damage of buildings under an MS-AS sequence can be predicted reasonably and accurately by city-scale nonlinear THA.(2)An MS-AS sequence can be generated reasonably by the proposed MS-AS sequencegeneration method.(3)Regional seismic damage of buildings under different MS-AS scenarios can be provided efficiently by the proposed framework,which in turn can provide a useful reference for earthquake emergency response and scientific decision making for earthquake disaster relief.

关键词： regional seismic damage prediction city-scale nonlinear time-history analysis mainshock-aftershock sequence multiple degree-of-freedom(MDOF)model 2014 ludian earthquake

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