Field excursion guide to Usu and Tarumai volcanoes and Nobortibetsu Spa
Izumi Yokoyama, M. Murozumi, Nihon Kazan Gakkai, International Association of Volcanology and Chemistry of the Earth's Interior
Volcanological Society of Japan, 1981 - Nature - 64 pages
7 pages matching Second stage in this book
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_ I _ amount andesite ash fall Augite-hypersthene dacite August basalt bicarbonate ion caldera ﬂoor Chemical compositions chloride ion concentration Crater craterlets crustal movements cryptodome dacite dacite lava dome deposits Distribution dome lava earthquake swarm eastern foot ejected eruption of Usu explosion craters ﬁeld ﬁrst ﬂank foot of Ko-Usu foot of Usu fumaroles geodetic Geophysical Hiyori-yama hot springs Hypersthene Hypersthene dacite hypocenters I I I I I I Jigoku-dani Katsui Kuttara pumice fall Kuttara pumice ﬂow Kuttara Volcano Lake Toya lava dome magma major faults Matsuo Meiji-Shinzan Minakami mudﬂows Murozumi Noboribetsu Spa northern foot nuee ardente O-yunuma observed Ogari-yama phenocrysts phreatic eruptions phreatic explosion phreatomagmatic pumice and ash pyroclastic ﬂow rhyolite Second stage Showa-Shinzan lava dome shown in Fig Sobetsu Sobetsu Spa stage eruption stratovolcano sulfur summit caldera tephra Toya Caldera Toyako Toyako Spa upheaval uplifted Usu Volcano Usu-Shinzan Yokoyama