ALOS/PALSAR干渉画像による秋田県東成瀬地区地すべりのモニタリング

抄録

InSAR image is well-known as detecting crustal movement in wide area when hazardous events like earthquakes and volcanic activities occur. In addition to grasping such wide movement, small and regional movements like landslide can be also detected from InSAR image. On the basis of the previous study on Noto Hanto Earthquake in 2007, the authors delved into possibility of the detection and monitoring at Higashi-Naruse village in Akita prefecture using ALOS/PALSAR data in this study. Also, landslide delimitation was done by making out micro-topography map created by air-borne laser data.
There are many famous landslides in this area, e.g. Yachi Landslide. Among those landslides, Ohkamizawa Landslide on the right bank of Naruse river is an active one at rates of more than 10cm/year, and this landslide movement could be observed at InSAR image.
This study showed that InSAR image is very useful for detecting not only just existence of landslide movements but also time variation of extent, magnitude, uniformity of movements, and also reconfirmed the usefulness of air-borne laser data in classifying landform in micro scale.