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Title: 有珠火山2000年新山からの総放熱率
Other Titles: Quantitative evaluation of heat discharge rates from the geothermal area formed during the 2000 eruption of Usu volcano, Japan
Authors: 寺田, 暁彦1 Browse this author
鍵山, 恒臣2 Browse this author
松島, 喜雄3 Browse this author
吉川, 慎4 Browse this author
吉川, 章文5 Browse this author
小山, 寛6 Browse this author
山﨑, 伸行7 Browse this author
平松, 秀行8 Browse this author
大島, 弘光9 Browse this author
Authors(alt): Terada, Akihiko1
Kagiyama, Tsuneomi2
Matsushima, Nobuo3
Yoshikawa, Shin4
Yoshikawa, Akihumi5
Koyama, Hiroshi6
Yamazaki, Nobuyuki7
Hiramatsu, Hideyuki8
Oshima, Hiromitsu9
Issue Date: 15-Mar-2009
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: 72
Start Page: 139
End Page: 157
Abstract: We estimate heat-discharge rates for a geothermal area formed during the 2000 eruption of Usu volcano, Japan. Field observations carried out in September 2006 reveal that heat-discharge rates from fumaroles, areas of steaming grounds and crater lakes are 8, 9.2, and 2 MW, respectively. The total heat-discharge rate measured in September 2006 represents just 1% of the rate immediately following the eruption. Integration of the heat-discharge rate from April 2000 to September 2006 yields an accumulated discharge of approximately 2.3 × 10^[16]J, equating to the cooling of 8 × 10^6 m^3 of magma. This amount of magma corresponds to several percent of the total intruded magma volume estimated from analyses of ground deformation associated with the 2000 eruption. Compared with the 1977 eruption, the 2000 eruption involved the discharge of large amounts of heat from fumaroles. Fumaroles that developed during the 2000 eruption showed a decline in activity in short time. Areas of steaming ground associated with the 2000 eruption showed more 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 (e.g., permeability around the intruded magmas) led to contrasting patterns of propagation of the hydrothermal systems around the intruded magmas.
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72号

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