航空機搭載型多波長走査計による有珠山2000年噴火の多時期観測(<特集>2000年有珠山噴火 (2))

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Extensive infrared (IR: 8.00〜11.00μm) and visible/near-infrared (VNIR: 0.51〜2.35μm) images from airborne multispectral scanners (MSS: VAM-90A, AZM) were acquired over the Usu volcano in Hokkaido before and after the 2000 Usu eruption. IR images give the apparent ground-surface brightness temperatures of the geothermal area and its spatial distribution. VNIR images can be used to determine spectral signatures of the ground surface. The airborne MSS observations were carried out on 4 October 1999, 3 April 2000, 26 April 2000, 25 May 2000, 16 June 2000, 14 July 2000, I August 2000, 20 September 2000 and 24 October 2000. After the 2000 Usu eruption (31 March 2000), we could detect geothermal activities of the newly formed crater groups (Nishiyamanishi crater group and Konpirasan crater group). The ground-surface brightness temperatures around the newly formed crater groups were less than 60℃. The brightness-temperature in the craters were not able to be detected well because of the existence of a large amount of fumarolic gas. Only the observation on 24 October 2000 was able to measure the temperature of the N31 crater partially, and its temperature was 70 to 142℃. No observation revealed any significant temporal change of geothermal activities in the summit area of Mt. Usu. The ash fall area from the eruption can be estimated using VNIR images. The temporal changes in the estimated ash fall area indicate that the ash fell intensively in the first stage of the eruption from 3 April 2000 to 25 May 2000. We also discuss the applicability of airborne MSS techniques to identifying the influence of the terrestrial heat and the solar radiation on the ground-surface brightness temperatures.
特定非営利活動法人日本火山学会の論文
2002-09-17

航空機搭載型多波長走査計による有珠山2000年噴火の多時期観測(<特集>2000年有珠山噴火 (2))

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