Research to extract slopes with risk of landslides, using the LiDAR data measured before and after a hazard.

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I compared the hillshade and contour maps, using the LiDAR data measured before and after the Iwate-Miyagi Nairiku Earthquake occurred on June 18, 2008. And, I have extracted the site where the transformation is confirmed to the slope. On these slopes, the occurrence of cracks was confirmed by the field survey. On these slopes, I did the soil exploration. As a result, it was confirmed that a weathering thick layer (N-value is less than 20) existed in these slopes and a weak layer (N-value is less than 10) existed between weathering layers. In addition, I calculated the return periods of rainfall and the soil water index on the basis of the AMeDAS data near the study area. As a result, it was confirmed that the possibility of landslide occurrence was low in the rainfall after the earthquake. Therefore, it was guessed that the possibility of landslide occurrence according to rainfall after the earthquake was relatively high in these slopes.