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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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空中赤外観測に基づく噴気地および火口湖面からの放熱量推定 -有珠火山・登別火山・北海道駒ケ岳火山-

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Title: 空中赤外観測に基づく噴気地および火口湖面からの放熱量推定 -有珠火山・登別火山・北海道駒ケ岳火山-
Other Titles: Airborne IR surveys of Usu, Noboribetsu and Hokkaido-Komagatake volcanoes: Evaluation of heat discharge rates from steaming grounds and hot crater lakes
Authors: 寺田, 暁彦1 Browse this author
吉川, 慎2 Browse this author
大島, 弘光3 Browse this author
前川, 徳光4 Browse this author
松島, 喜雄5 Browse this author
Authors(alt): Terada, Akihiko1
Yoshikawa, Shin2
Oshima, Hiromitsu3
Maekawa, Tokumitsu4
Matsushima, Nobuo5
Issue Date: 19-Mar-2012
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 75
Start Page: 25
End Page: 41
Abstract: Aerial IR surveys were carried out in September 2010 over geothermal areas at Usu, Noboribetsu and Hokkaido-Komagatake volcanoes, Japan. The heat discharge rate from steaming grounds that formed during the 2000 eruption of Usu volcano is estimated to be 5.6 MW, which is half the rate measured in September 2006. Integration of the heat discharge rate from April 2000 to September 2010 yields an accumulated discharge of approximately 2.4 × 1016 J. This amount of heat corresponds to several percent of the total intruded magma heat estimated from analyses of ground deformation associated with the 2000 eruption. Areas of steaming ground associated with the 2000 eruption showed rapid growth compared with those of the 1977 eruption but discharged less heat. We suspect that differences in the hydrological environments of the two eruptions, led to contrasting patterns of propagation of the hydrothermal systems around the intruded magmas.   The heat discharge rate from the summit areas of Usu volcano, Showa-shinzan and Noboribetsu volcano in 2010 are estimated to be 40, 6.2 and 22 MW, respectively, similar to the rates measured in September 2006.   No high-temperature grounds were detected at the vents and fissure formed during the 1942 eruption of Hokkaido-Komagatake volcano. We observed no geothermal activities at vents associated with the 1929, 1996, 1998 and 2000 eruptions, due to the absorption effect of atmospheric cloud.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第75号

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