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http://dx.doi.org/10.9719/EEG.2020.53.6.715

Evaluation of Volcanic Processes and Possible Eruption Types in Ulleung Island  

Hwang, Sang Koo (Department of Earth and Environmental Sciences, Andong National University)
Jeong, Seong Wook (Institute of Basic Sciences, Andong National University)
Ryu, Han Young (Korea Water Resources Corporation)
Son, Young Woo (Korea Water Resources Corporation)
Kwon, Tae Ho (Korea Ohyeon Mineral Museum)
Publication Information
Economic and Environmental Geology / v.53, no.6, 2020 , pp. 715-727 More about this Journal
Abstract
Volcanostratigraphy in Ulleung Island is divided into 4 stratigraphic groups: Dodong Basaltic Rocks, Ulleung Group, Seonginbong Group and NariGroup. The main pyroclastics in them includes lapilli tuff intercalated within the Dodong Basaltic Rocks, lapilli tuff at the top of Sadong Breccia, Sataegam Tuff, Gombawi Welded Tuff, Bongrae Scoria Deposits, Maljandeung Tuff, Nari Scoria Deposits and Jugam Scoria Deposits. Analysing eruption types, The lapilli tuff in the Dodong Basaltic Rocks is derived from Surtseyan eruption, and the Bongrae, Nari and Jugam Scoria Deposits are caused by Strombolian eruptions or/and sub-Plinion eruptions, but the Sataegam Tuff and Maljandeung Tuff are derived from Plinian and phreatoplinian eruptions. Among them the large-scaled eruptions. In particular, the eruptions of Maljandeung were large enough to result in caldera collapse, and had falled out tephras to the eastern Korean peninsula but even Japan Islands. The magma with high potential to be still alive is judged to be trachyandesitic and phonolitic in composition. If the trachyandesitic magma explodes, it will probably result in a strombolian eruption and have a fairly low explosivity, but if the phonolitic magma explodes, it will probably result in a plinian eruption and have a much higher explosivity. If the eruption had a high explosivity, there is a possibility that it could easily be converted into a phreatoplinian eruption due to the influx of groundwater by the easy generation of fractures. These large-scaled eruptions could fall out tephras to the eastern Korean peninsula but even Japan Islands.
Keywords
Ulleung Island; eruption types; strombolian eruption; plinian eruption; explosivity;
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Times Cited By KSCI : 8  (Citation Analysis)
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