The 2018 Hokkaido Eastern Iburi earthquake (Mj 6.7, Mw 6.6), occurred on the 6th of September 2018 and triggered thousands of landslides in pyroclastic fall deposits. The triggered landslides caused destructive damages to the structures and resulted in serious causalities. Hundreds of earthquakes persisted after the mainshock and the Iburi region is of high possibility to suffer major earthquakes in the future. An effective method to assess the seismic slope stability is of great importance for the disaster prevention and mitigation in the Iburi region. Based on the isopachs of different pyroclastic fall deposits mantled in the study area, GIS was employed to process the input soil layers and construct the 3D domain. By applying different horizontal pseudo-acceleration coefficients in the Scoops3D program, the factor-of-safety maps of eight cases were obtained. After validating by the coseismic landslide inventory, the performance of the computed results was evaluated. A horizontal pseudo-acceleration coefficient between 1/2 and 2/3 of PHGA is suitable for seismic slope stability assessment in pyroclastic fall deposits. The catastrophic Tomisato landslide and Yoshinoya landslide were correctly predicted. Scoops3D proves to be an effective and efficient method for guiding disaster mitigation and management.

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基于Scoops3D和GIS的三维地震边坡稳定性评估-以北海道厚间为例

2018年的北海道东部伊布里（Ejuri）地震（Mj 6.7，Mw 6.6）于2018年9月6日发生，并在火山碎屑沉积物中引发了数千次滑坡。触发的滑坡对结构造成破坏性破坏，并导致严重的因果关系。在主震发生后，数百地震持续存在，伊布里地区未来很有可能遭受大地震。评估地震边坡稳定性的有效方法对于伊布里地区的防灾减灾具有重要意义。基于研究区覆盖的不同火山碎屑沉积物的等值线，利用GIS处理输入的土壤层并构建3D域。通过在Scoops3D程序中应用不同的水平伪加速度系数，获得了八例的安全系数图。在通过同震滑坡清单进行验证后，评估了计算结果的性能。PHGA的1/2和2/3之间的水平伪加速度系数适用于火山碎屑沉积物的地震边坡稳定性评估。可以正确预测灾难性的富里滑坡和吉野家滑坡。实践证明，Scoops3D是指导减灾和管理的有效方法。可以正确预测灾难性的富里滑坡和吉野家滑坡。实践证明，Scoops3D是指导减灾和管理的有效方法。可以正确预测灾难性的富里滑坡和吉野家滑坡。实践证明，Scoops3D是指导减灾和管理的有效方法。