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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: 阿寒カルデラとその周辺の重力構造
Other Titles: Gravity Structure of the Akan Caldera and Its Vicinity, Eastern Hokkaido, Japan
Authors: 長谷川, 健1 Browse this author
山本, 明彦2 Browse this author
神山, 裕幸3 Browse this author
中川, 光弘4 Browse this author
Authors(alt): HASEGAWA, Takeshi1
YAMAMOTO, Akihiko2
KAMIYAMA, Hiroyuki3
NAKAGAWA, Mitsuhiro4
Issue Date: 15-Mar-2006
Publisher: 北海道大学大学院理学研究科地球惑星科学専攻(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: 69
Start Page: 97
End Page: 112
Abstract: We performed gravity surveys and compiled pre-existing gravity data to obtain gravity anomalies of the Akan Caldera, eastern Hokkaido, and a new gravity map around the caldera was produced. In particular, we conducted gravity surveys on the frozen lake surface in winter to reveal a fine gravity structure. A new Bouguer anomaly map shows that the Akan Caldera is characterized by three closed mimima and takes its minimum value(~70mgal)in the central area of the caldera. It is consistent with our geologic studies suggesting that the Akan Caldera is multiple caldera. Characteristic low anomalies in the Akan Caldera gradually increase towards topographic rim outside and reach their maximum around the rims. Post-caldera volcanoes are distributed not along topographic caldera rim but along a periphery of the low-anomaly region, which is situated inside the topographic rim.
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69号

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