リモートセンシングによる伊豆鳥島の2002年年噴火後の地殻変動と温度分布の観測

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(6) . Crustal Deformation and Surface Temperature Distribution Observed by Remote-Sensing Techniques after the ,**, Izu-Torishima Eruption Yutaka WADA, Tetsuya JITSUFUCHI, Hiroshi OHKURA and Motoo UKAWA The volcanic island, Izu-Torishima, erupted in August, ,**,. The National Research Institute for Earth Science and Disaster Prevention observed the crustal deformation and surface temperature distribution of the island after the eruption by using remote-sensing techniques of Interferometric Synthetic Aperture Rader (InSAR) and airborne Multi-Spectral Scanner (MSS). The InSAR image from RADARSAT-+ data acquired about +/ and .* days after the eruption exhibits no large deformation exceeding several centimeters for the entire island, showing the limit of the analysis without any ground control points (GCPs). However, a small local movement (less than ,.2 cm) is observable at the center of the island. The airborne MSS, VAM-3*A, obtained the surface temperature distribution from infrared bands and pseudo-color images from visible and near-infrared bands almost one year after the eruption. The high-temperature area (over 1*C) is limited around the central crater, where the ground surface is covered by sublimed sulfur. The highest temperature of 2*C is detected in this area. Key words : Izu-Torishima ,**, eruption, remote sensing, InSAR, multi spectral scanner. + . HW 12 9B<J5/:. ,**, 2

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