Journal
LANDSLIDES
Volume 10, Issue 1, Pages 75-82Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10346-012-0353-5
Keywords
Slope failure; Rock slides; Snowmelt; Alpine environment
Funding
- Research and Education Funding for Japanese Alps Inter-Universities Cooperative Project, MEXT, Japan
- Grants-in-Aid for Scientific Research [23300334] Funding Source: KAKEN
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The Aresawa rockslide in the Japanese Alps encountered a deep, partial collapse during an early snow-melting period in May 2004, followed by further progressive movement of the headscarp area. This paper reconstructs the pre-failure topography of the Aresawa rockslide based on the analysis of aerial photographs taken in multiple periods, and analyzes the factors controlling the threshold for the 2004 collapse. At least seven months before the collapse, new tension cracks emerged about 25 m behind the headscarp as a result of downslope movement of an unstable rock slab 5-10 x 10(5) m(3) in volume, accompanied by the development of a slip plane below a pre-existing shallow trough (sackung feature). The collapse finally occurred when progressive weakening of the rock mass was combined with water infiltration into the ground during rapid snow melting.
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