Activity and distribution of geohazards induced by the Lushan earthquake, April 20, 2013
Activity and distribution of geohazards induced by the Lushan earthquake, April 20, 2013
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2013年4月20日芦山地震地质灾害活动及分布
DOI：
10.1007/s11069-014-1100-0
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发表时间：
2014-02
期刊：
影响因子：
3.7
通讯作者：
Li, Yong
中科院分区：
文献类型：
--
作者：
Cui, Peng;Zhang, Jianqiang;Yang, Zongji;Chen, Xiaoqing;You, Yong;Li, Yong
2013年4月20日，芦山发生7.0级地震，震源深度13公里，造成196人死亡，21人失踪，13484人受伤，受灾人数超过200万人。地震发生后立即进行了现场调查，并与汶川地震进行了对比分析。我们发现了1460个滑坡和雪崩和4个堰塞湖，这些湖泊一般规模较小，集中在高海拔地区。芦山宝盛镇金鸡峡、双石镇大崖峡和S210省道凌关镇以北的小官子K317段等硬岩峭壁陡坡上发育雪崩、落石。滑坡相对较少，以中、小规模为主，主要发育在砂岩、页岩和松散崩积层中。仅观察到一次大型滑坡转变为泥石流。堰塞湖是由雪崩和滑坡形成的，规模小，危险程度低。地震灾害沿断层上盘呈带状分布，其主要控制因素包括构造、岩性、构造面和地形。超过99%的滑坡发生在震中30公里以内，10公里以内的滑坡发生678起，占总数的46%；约50%的滑坡分布在35°~ 55°的斜坡上，11%的滑坡分布在75°以上的斜坡上；60%在海拔1000 - 1500米的山坡上，77%在海拔900 - 1500米的山坡上；在硬岩和介于硬软岩之间的剖面中分别占24%和62%。与汶川地震相比，芦山地震灾区滑坡和雪崩的数量和范围都要小得多，仅为5.53%，面积为0.57%。地震增加了边坡的不稳定性和发生滑坡、泥石流的可能性。因此，与汶川地震灾区相比，预计活跃期相对较短。然而，隐患的隐蔽性给风险调查带来了困难。
An Ms7.0 earthquake, focal depth 13 km, struck Lushan on April 20, 2013, caused 196 deaths and 21 missing, 13,484 injuries, and affected more than two million people. A field investigation was taken immediately after the quake, and the induced hazards were analyzed in comparison with the Wenchuan earthquake. We have identified 1,460 landslides and avalanches and four dammed lakes, which were generally small and concentrated on high elevation. Avalanches and rockfalls developed in cliffs and steep slopes of hard rocks, including Jinjixia of Baosheng Town and Dayanxia of Shuangshi Town, Lushan, and the K317 section the Xiaoguanzi section north to Lingguan Town along the provincial highway S210. Landslides were relatively less, mainly in moderate and small scales, developing in sandstone, shale, and loose colluviums. Only one single large landslide was observed to turn into debris slide-flow. Dammed lakes were formed by avalanches and landslides, all in small size and of low danger degree. The earthquake-induced hazards distributed in belt on the hanging wall along the faults, and their major controlling factors include tectonics, lithology, structure surface, and landform. More than 99 % landslides were within 30 km to the epicenter, and 678 within 10 km, accounting for 46 % of the total; about 50 % landslides were distributed on slopes between 35° and 55°, and 11 % on slope exceeding 75°; 60 % on slopes at the altitudes between 1,000 and 1,500 m, 77 % on slopes between 900 and 1,500 m; and 24 and 62 % in hard rocks and section between hard and soft rocks, respectively. Compared with the case of Wenchuan earthquake, both the number and extension of landslides and avalanches in Lushan earthquake-affected area are much smaller, only 5.53 % in number and 0.57 % in area. The earthquake has increased the instability of slope and potentiality of landslide and debris flow. Accordingly, the active period is expected to be relatively short comparing with that in Wenchuan earthquake-hit area. However, the insidious and concealed hazards bring difficulty for risk investigation.
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影响因子：
--
作者：
Cuiping Zhao;Lianqing Zhou;Zhang-li Chen
通讯作者：
Cuiping Zhao;Lianqing Zhou;Zhang-li Chen
DOI：
--
发表时间：
2010
期刊：
Journal of Sichuan University
影响因子：
--
作者：
Zhao Wan-yu
通讯作者：
Zhao Wan-yu
影响因子：
3.9
作者：
Chigira, Masahiro;Wu, Xiyong;Wang, Gonghui
通讯作者：
Wang, Gonghui
DOI：
--
发表时间：
2011
期刊：
--
影响因子：
--
作者：
Yin Yueping
通讯作者：
Yin Yueping
DOI：
10.1007/978-3-642-28744-2_98
发表时间：
2012
期刊：
--
影响因子：
--
作者：
F. Liu;Dewei Li;Demin Liu;Jiong Li;Huiming Tang
通讯作者：
F. Liu;Dewei Li;Demin Liu;Jiong Li;Huiming Tang