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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第84号 >


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Title: 蘭越町および共和町のボーリングコアに産出する洞爺カルデラ形成噴火噴出物について
Other Titles: Deposits of Toya caldera-forming eruption in boring cores at Kyowa and Rankoshi towns
Authors: 宮坂, 瑞穂1 Browse this author
中川, 光弘2 Browse this author →KAKEN DB
Authors(alt): Amma-MIYASAKA, Mizuho1
NAKAGAWA, Mitsuhiro2
Issue Date: 26-Mar-2021
Publisher: 北海道大学大学院理学研究院
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: 84
Start Page: 1
End Page: 10
Abstract: We examined boring cores excavated at Kyowa and Rankoshi towns to clarify stratigraphy and thickness of deposits of Toya caldera-forming eruption. As a result, there exists thick pyroclastic flow deposits of ca. 20m thick in these areas, and we also recognized fine-grained pyroclastic fall and pyroclastic flow deposits of 10cm-thick each below the thick pyroclastic flow deposits at Rankoshi. Glass compositions of these deposits are in the range of deposits of Toya caldera-forming eruption, suggesting that they are all derived from the eruption and upper pyroclastic flow deposits are more voluminous.
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84号

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