GIS analysis on geomorphological features and soil mechanical implication of landslides caused by 2004 Niigata Chuetsu earthquake

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  • ２００４年新潟県中越地震にともなう地すべり・崩壊発生場の地形・地質的特徴のＧＩＳ解析と土質特性の検討
  • 2004ネン ニイガタケン チュウエツ ジシン ニ トモナウ ジスベリ ホウカイ ハッセイバ ノ チケイ チシツテキ トクチョウ ノ GIS カイセキ ト ドシツ トクセイ ノ ケントウ

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Abstract

This study clarifies geomorphological and geological background of landslides caused by 2004 Niigata Chuetsu earthquake, using GIS analysis. And it also discusses soil mechanical features of the landslides before the earthquake. It is summarized as follows;<br>1. Most of newly formed deep seated landslides are reactivated ones distributed along Imokawa River that incises Uonuma Hills, forming steep valley side slope more than 30 degrees.<br>2. GIS processing reveals detail ground deformation of each large scale landslide, using DEM detected before and after the earthquake.<br>3. More than 60% of surface failure type landslides occurred on steep slope more than 45 degrees.<br>4. Most of deep seated landslides occurred on dip slope. Gradient of original slopes range from 13 to 26 degrees and the mode is from 21 to 26 degrees. That means original slope before the earthquake were quite stable, considering that the gradient mode of original slope consisted of the same types of geology in Northeastern Japan is from 15 to 20 degrees. And it implies the earthquake just triggered the landslides.<br>5. Soil tests and inversion analysis on slope stability confirm that earthquake tremor induced numerous landslide in the study area.

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