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第79号 >


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Title: 雌阿寒岳ナカマチネシリ火口の全磁力変化と熱活動
Other Titles: Magnetic total field changes and thermal activity around Nakamachineshiri crater, Meakandake
Authors: 田中, 良1 Browse this author
橋本, 武志2 Browse this author →KAKEN DB
鈴木, 敦生3 Browse this author
Authors(alt): TANAKA, Ryo1
SUZUKI, Atsuo3
Issue Date: 19-Mar-2016
Publisher: 北海道大学大学院理学研究院
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: 79
Start Page: 15
End Page: 23
Abstract: We performed measurements of the magnetic total intensity at Nakamachineshiri crater of Meakandake volcano, eastern Hokkaido, in 2013, 2014 and 2015. Comparing the three campaigns, we found small but systematic magnetic changes suggesting demagnetization at the shallow subsurface of the crater during 2014-2015. We estimated the best-fit demagnetized source as a sphere with magnetic moment of 2×106 Am2 at a depth of 250 m (960 m a.s.l) beneath the crater. We then considered it was brought by thermal demagnetization, and made an order estimation of the heating rate at the source by assuming a simplistic temperature-magnetization relationship. In addition, we assessed the surface heat loss due to discharging fumarolic gas, evaporation and radiation from hot ponds, and geothermal anomalies. Total amount of the surface heat discharge rate was estimated to be in a range from a few to 10-odd MW. This might be comparable or one-order smaller than the heating rate based on the crude estimation from magnetic measurements.
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79号

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