Urban Landslides Induced by The Mid Niigata Prefecture Earthquake in 2004

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  • ２００４年新潟県中越地震による都市域の斜面災害
  • 2004ネン ニイガタケン チュウエツ ジシン ニ ヨル トシイキ ノ シャメン サイガイ

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Abstract

Landslides triggered by the Chuetsu earthquake occurred in artificial slopes of some new developments in suburban Nagaoka, the largest city in the affected area. The landslides occurred in hilly terrain of the eastern part of Nagaoka between the alluvial plain and Tertiary folded mountains of Yamakoshi. Although the extent of landslides in urban Nagaoka was small compared with landslides on natural slopes (especially near Yamakoshi), they represent an important case study for urban landslide disasters. Slope instabilities in urban residential areas were classified as: A) landslides in steep embankments; B) landslides in gently sloping artificial valley fills; C) re-activation of old landslides; and D) liquefaction in deep artificial valley fills. These failures all occurred in relatively uniform suburban landscapes, which were significantly modified from the original landforms. Recent destructive earthquakes in Japan caused the similar types of slope failures in urban regions, suggesting that lessons from past earthquakes were not implemented. Governmental reconstruction assistances for urban residential areas are insufficient comparing to the generous assistance for mountainous district. The earthquake disaster should provide a momentum to consider the effective policy of distributing the limited resources.

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