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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第70号 >

ドーム状隆起に伴う磁場変化 ―有珠山2000 年噴火時の全磁力変化再検討―

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Title: ドーム状隆起に伴う磁場変化 ―有珠山2000 年噴火時の全磁力変化再検討―
Other Titles: Geomagnetic changes due to doming - The 2000 eruption of Usu volcano -
Authors: 橋本, 武志1 Browse this author
茂木, 透2 Browse this author →KAKEN DB
西田, 泰典3 Browse this author
高田, 真秀4 Browse this author
鈴木, 敦生5 Browse this author
前川, 徳光6 Browse this author
佐藤, 秀幸7 Browse this author
Authors(alt): HASHIMOTO, Takeshi1
MOGI, Tohru2
NISHIDA, Yasunori3
TAKADA, Masamitsu4
SUZUKI, Atsuo5
MAEKAWA, Tokumitsu6
SATOH, Hideyuki7
Issue Date: 15-Mar-2007
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: 70
Start Page: 123
End Page: 135
Abstract: We investigated geomagnetic changes due to dome-like deformation by using a truncated circular cone model. In the case of the normal magnetization, magnetic total field decreases in the northern side of the uplift center, while it increases in the southern side. We found that the original topography prior to the mound formation does not affect the pattern of this magnetic change. We then apply this calculation to the mound-forming activity in the 2000 eruption of Usu Volcano to infer the magnetic change on the foot of the mound. The expected range of magnetic total field change at the station U01 is -80 to -800 nT which is in the opposite sense to the observed actual change (+70 nT). We examined some alternative mechanisms to compensate this decrease due to the deformation. None of them, however, can be a promising candidate. The most reasonable explanation so far for this contradiction is the reversed magnetization of the Tertiary lava that may comprise the mound.
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70号

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