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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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Title: 有珠山西山火口群での全磁力測量
Other Titles: Magnetic survey at the 2000 eruption area of Usu volcano
Authors: 小池, 哲司1 Browse this author
長谷川, 浩2 Browse this author
藤井, 郁子3 Browse this author
橋本, 武志4 Browse this author
Authors(alt): Koike, Tetsuji1
Hasegawa, Hiroshi2
Fujii, Ikuko3
Hashimoto, Takeshi4
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: 117
End Page: 124
Abstract: We conducted a total field magnetic survey in the 2000 eruption area of Mt Usu. A distinct negative magnetic anomaly was found in the geothermal field in the NW part of the survey area. Meanwhile, no clear magnetic anomaly was found around N-B crater, where active fumaroles were seen. Regarding the negative anomaly in the geothermal field, we performed a 3-D inversion of demagnetized prism model. As a result it has been suggested that the magnetic anomaly is due to the demagnetization at a small depth less than 70 m from the ground surface.
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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