Regional landslide susceptibility following the Mid NIIGATA prefecture earthquake in 2004 with NEWMARK’S sliding block analysis
Regional landslide susceptibility following the Mid NIIGATA prefecture earthquake in 2004 with NEWMARK’S sliding block analysis
复制标题
DOI：
10.1007/s10346-017-0833-8
复制
发表时间：
2017-05
期刊：
影响因子：
6.7
通讯作者：
M. Shinoda;Y. Miyata
中科院分区：
文献类型：
--
作者：
M. Shinoda;Y. Miyata
本研究提出了一种区域地震诱发滑坡敏感性的计算方法，该方法采用Newmark滑动块分析计算的永久地震位移，并估计垂直和水平地震运动。该方法考虑了边坡破坏方向的基础上指定的边坡方位角。研究结果揭示了优势边坡破坏方向的重要性，使用一个简单的无限边坡模型受到地震。地震诱发滑坡敏感性分析的目标区域构成了2004年新泻县中部地震震中周围2000平方公里以上的区域。地震诱发的滑坡敏感性地图创建的基础上提出的方法与摩擦角和凝聚力的特定组合，并将由此产生的数据进行了比较，从航空照片产生的滑坡库存地图后，在2004年新泻县地震。为了创建磁化率图，反算边坡的岩土粘聚力值，以满足静态下的最小安全系数。提出了预测率的计算方法，确定了岩土材料强度参数的反算值。建议的区域滑坡敏感性图将有助于了解潜在的斜坡破坏位置和破坏程度，以及规划现场调查和预防地震后立即发生的次生灾害。
This study proposes a calculation method for regional earthquake-induced landslide susceptibility that applies the permanent seismic displacement calculated using Newmark’s sliding block analysis with estimated vertical and horizontal seismic motions. The proposed method takes into account the direction of slope failure based on the specified slope azimuth. The study results reveal the importance of predominant slope failure direction using a simple infinite slope model subjected to earthquakes. The target area for the earthquake-induced landslide susceptibility analysis constituted a region of more than 2000 km2surrounding the epicenter of the Mid Niigata prefecture earthquake in 2004. An earthquake-induced landslide susceptibility map was created based on the proposed method with a specific combination of friction angle and cohesion, and the resulting data were compared to the landslide inventory map produced from aerial photographs following the Mid Niigata prefecture earthquake in 2004. To create the susceptibility map, geomaterial cohesion values for the slope were back-calculated to satisfy the minimum safety factor in the static state. This study also proposes a calculation method for the prediction rate and determines the back-calculated strength parameters of geomaterials. The proposed regional landslide susceptibility map will be useful for understanding potential slope failure locations and magnitude of damage, as well as for planning field investigation and preventing secondary disasters immediately after earthquakes.