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カルデラ形成までの 1 万年間における伊豆大島火山の活動 II
Activity of Izu-Oshima Volcano during 10, 000 Years Prior to the Caldera Formation : A Volcano-stratigraphic Approach II
1981
Bulletin of the Volcanological Society of Japan
Activity of Izu-Oshima Volcano during 10, 000 Years Prior to the Caldera Formation : A Volcano-stratigraphic Approach II
Preserved Fulltext
Additional data on the volcanic activity of Izu − Oshima is presented based on the detailed stratigraphic study of the Older Oshima Group in the southern part of the island . 1. The horizon of the lenticular 】 ava flow which crops out on the southern coastal clifF at Yatsuiso is O20f the Older Oshima Gro 叩 . 2. The scoria cone Sado ・ yama , is inferred to have been formed in the O1。 time . 3. The horizon of the uppermost one of three lava flows which crops out on the coastal cliff from Kootoshi to Otaine is OL4.
doi:10.18940/kazanc.26.4_249
fatcat:j26ebxfxtvdupiad7w26w6ack4