2024-03-29T07:55:33Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/806952022-11-17T02:08:08Zhdl_2115_80693hdl_2115_116hdl_2115_13714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Deposits of Toya caldera-forming eruption in boring cores at Kyowa and Rankoshi towns宮坂, 瑞穂Amma-MIYASAKA, Mizuho1000050217684中川, 光弘NAKAGAWA, Mitsuhiroopen accessCreative Commons Attribution-NonCommercial 4.0 International450We 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.北海道大学大学院理学研究院2021-03-26jpndepartmental bulletin paperVoRhttps://doi.org/10.14943/gbhu.84.1http://hdl.handle.net/2115/8069510.14943/gbhu.84.10439-3503AN0008976X北海道大学地球物理学研究報告Geophysical bulletin of Hokkaido University84110https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/80695/4/Appendix%28glass%20composition%29.xlsapplication/vnd.ms-excel96.0 KB2021-03-26https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/80695/1/GBHU_84_p1-10.pdfapplication/pdf4.15 MB2021-03-26