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| | Abstract | | We have developed a method to assess rock-fall risk by comparing vibrations of a loosened rock block with that on the base rock.Since November in 2015, we have been monitoring vibration characteristics for a rock block partially embedded near surface of steep natural slope in Nagano prefecture. The rock block stabilization in cold winter and unstabilization in warmer season was reported by previous report. We report a fluctuation of stability in a high temperature season and at the time of an amount of rainfall rise in the rainy season. And we report on the car vibration which is more main vibration source and particle motion of the rock block. |
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