Regional landslide susceptibility following the 2016 Kumamoto earthquake using back-calculated geomaterial strength parameters
Regional landslide susceptibility following the 2016 Kumamoto earthquake using back-calculated geomaterial strength parameters
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DOI：
10.1007/s10346-019-01171-1
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发表时间：
2019-08
期刊：
影响因子：
6.7
通讯作者：
M. Shinoda;Y. Miyata;U. Kurokawa;Kenichi Kondo
中科院分区：
文献类型：
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作者：
M. Shinoda;Y. Miyata;U. Kurokawa;Kenichi Kondo
2016年熊本地震于2016年4月14日在日本熊本首次发生，震级为6.5级。随后，28小时后，2016年4月16日发生了一次更大的地震，震级为7.3级。这些地震是由两个活动断层引起的：二川断层和日向断层。本文提出了一种考虑岩土材料强度从峰值到剩余状态的衰减和地震动方向性的滑坡敏感性计算方法。虽然有一个缺乏信息的岩土材料的强度参数的斜坡，参数分析与各种强度参数的摩擦角和凝聚力进行。为了模拟2016年熊本地震引发的实际滑坡，通过建议的加权预测率优化了每种岩性中摩擦角和粘聚力的最佳组合。根据计算出的永久地震位移，绘制了滑坡敏感性图，以显示包括100平方公里在内的广大区域的敏感性程度。拟议的区域滑坡易发性图对于估计可能的边坡破坏的位置和破坏程度以及规划现场勘察和防止地震后立即发生次生灾害将是很有价值的。
The 2016 Kumamoto earthquake first occurred on April 14, 2016 with magnitude 6.5 in Kumamoto, Japan as a foreshock. Subsequently, after 28 h, an even larger earthquake occurred with magnitude 7.3 as the main shock on April 16, 2016. These earthquakes were caused by two active faults: the Futagawa and Hinagu faults. This paper proposes a landslide susceptibility calculation method that considers the geomaterial strength reduction from peak to residual state and ground motion directivity. Although there is a lack of information regarding the strength parameters of geomaterials in the slopes, a parametric analysis with various strength parameters of friction angle and cohesion was carried out. To simulate the actual landslides triggered by the 2016 Kumamoto earthquake, the best combination of friction angle and cohesion in each lithology was optimized by a proposed weighted prediction rate. Based on the calculated permanent seismic displacement, a landslide susceptibility map was produced to show the degree of susceptibility over a wide area comprising 100 km2. The proposed regional landslide susceptibility map will be valuable for estimating the locations of possible slope failures and the extent of damage, as well as for planning field reconnaissance and preventing secondary disasters immediately after earthquakes.