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

我用2008年6月18日岩手宫城内陆地震前后测量的激光雷达数据，比较了山影图和等高线图。并且，我已经提取出了这个位置这个位置的变换被确定为斜率。在这些斜坡上，通过实地调查证实了裂缝的存在。在这些斜坡上，我进行了土壤探测。结果表明，这些边坡存在一个风化厚层（n值小于20），风化层之间存在一个弱层（n值小于10）。此外，我还利用研究区附近的AMeDAS数据计算了降雨的回归期和土壤水分指数。结果表明，在震后降雨条件下，滑坡发生的可能性较低。因此，根据地震后降雨推测，这些边坡发生滑坡的可能性较高。

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.