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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: 体積歪変化量から推定した伊豆東部火山群のマグマ貫入量と火山活動評価の試み
Other Titles: Estimation of Amount of Intrusive Magma by Using Volumetric Strain Data and Attempt of Evaluation of Volcanic Activity in Izu-Tobu Volcanoes
Authors: 宮村, 淳一1 Browse this author
上野, 寛2 Browse this author
横田, 崇3 Browse this author
Authors(alt): MIYAMURA, Jun'ichi1
UENO, Hiroshi2
YOKOTA, Takashi3
Issue Date: 19-Mar-2010
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: 73
Start Page: 239
End Page: 255
Abstract: Many dyke intrusion events have repeatedly occurred at Izu-Tobu Volcanoes since 1978.In order to evaluate volcanic activity of Izu-Tobu Volcanoes and to forecast the volcanic eruption,we investigate relationship between the amount of intrusive magma estimated from dyke parameters obtained by previous studies and the amount of volumetric strain change observed at Higashi-Izu.As a result,we find that there is an obvious correlation between the volume of dyke intrusions and the maximum amount of volumetric strain changes in 24 hours. In addition,we notice that large magma intrusion causes a remarkable seismic activity more than expected from the amount of volumetric strain changes. We propose a new technique for estimating the volume of dyke intrusion by using volumetric strain data observed at Higashi-Izu and introduce a new alert criteria based on the potential of volcanic eruption at Izu-Tobu Volcanoes.If our alert criteria is introduced,it is possible that volcanic warning is issued in an earlier stage of dyke intrusion event compared with the past.
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73号

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