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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: 雲仙火山周辺域における相対応力場と1990-1995年噴火活動
Other Titles: Relative stress field around Unzen Volcano and its relationship with the 1990-1995 eruption
Authors: 河野, 裕希1 Browse this author
松本, 聡2 Browse this author
松島, 健3 Browse this author
植平, 賢司4 Browse this author
清水, 洋5 Browse this author
馬越, 孝道6 Browse this author
Authors(alt): Kohno, Yuhki1
Matsumoto, Satoshi2
Matsushima, Takeshi3
Uehira, Kenji4
Shimizu, Hiroshi5
Umakoshi, Kodo6
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: 363
End Page: 371
Abstract: We investigated a stress field around the magma chamber beneath Unzen Volcano, Kyushu, Japan, which erupted from 1990 until 1995, by using a stress-tensor inversion method. We used P wave polarity data of seismograms by earthquakes occurred during 1985-1999 for analysis. Our result clearly indicated that there were no changes in stress field during the period except for during 1986-1988. This suggested that the magma intrusion into shallower depths did not affect the stress field in this region. Clear change in stress field was observed during 1986-1988. This might be explained by applying the meshtexture crack model proposed by Hill (1977).
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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