ALOS/PALSARデータの干渉解析による白山の地すべり変位の検出

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  • Detection of Landslide Displacement at the Hakusan volcano from Interferometric Analysis of ALOS/PALSAR data
  • ALOS PALSAR データ ノ カンショウ カイセキ ニ ヨル ハクサン ノ ジスベリ ヘンイ ノ ケンシュツ

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A continuous landslide about 10 cm per year has been observed for about 30 years around the Jinnosuke valley of the Hakusan volcano from GPS and/or EDM observations. To reveal the spatial coverage of the landslide around the Jinnosuke valley, we generate 23 differential SAR interferograms (15 Ascendings and 8 Descendings) around the Jinnosuke valley of the Hakusan volcano using 15 SAR acquisitions of PALSAR data from 2006 to 2009. The raw SAR data are processed by using the JAXA/SIGMA-SAR. We apply a linear relationship between altitudes and phase difference changes to remove the effect of the propagation delay on the entire interferogram due to the vapor in the atmosphere. We find the interferometric fringes of the displacement on surface due to the landslide in three interferograms between June and October in 2007 and 2009. The occurrence of the landslide over several hundred meters to 2 km squares is recognized around the Jinnosuke and the Senzai valleys. The horizontal displacement of the landslide is several to 25 cm per year. The estimations around the Jinnnosuke valley are coincident with GPS and EDM observations. Comparison of the two interferograms which were acquired in 2007 shows that the whole area of the landslide has not changed temporally while we can find the difference in the areas with large displacement between the two. We, thus, consider that the local landslide occurs independently in time and space due mainly to a seasonal change in underground water channel.

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