Earthquake risk assessments on fill slope instability in urban residential areas

最近发生在城市地区的破坏性地震，如1978年的宫根树地震和1995年的孝古根南部地震，引发了仙台、西宫和神户等城市周围许多住宅区的不稳定，这些地区与20世纪20年代以来持续的城市发展有关。已发生的地震坡面失稳滑坡危险性图与这些人工地貌变化，特别是人工填谷（堤防）变化密切相关。这些风险地图，1/10000 Jiyugaoka，武藏小杉，鹤见和新横滨，显示了未来滑坡灾害的可能性。根据地图，在这个大都市区，超过一半的填充物将被归类为地震后不稳定的填充物边坡，属于高风险不稳定组。所有政府发展计划的地质方面，不仅要考虑测量地面情况的岩土工程，更重要的是要考虑向居民提供信息。

Recent destructive earthquakes in urban regions, such as the 1978 Miyagiken-oki earthquake and the 1995 Hyougoken-nanbu earthquake, have triggered instability in many of the gentle slopes in residential areas around Sendai, Nishinomiya and Kobe cities related to the urban development that has continued since the 1920s. The landslide risk maps with earthquake-induced slope-instability that has occurred is closely related to these artificial landform changes, especially with artificial valley fills (embankments) were made. These risk maps, 1/10000 Jiyugaoka, Musashi-kosugi, Tsurumi, and Shin-yokohama, show the potential of future landslide disasters. According to the maps, more than half of fills would be classified into a high-risk of instability group as the unstable fill slope following an earthquake in this metropolitan region. The geological aspects of all government developments plans should considered not only in terms of geotechnical engineering for surveying ground conditions, but also importantly in terms of providing information to residents.