Eruption Cycles and Volcanic Form of the Dokdo Volcano, Korea

독도 화산의 분출윤회와 화산형태

  • 황상구 (안동대학교 지구환경과학과) ;
  • 전영권 (대구가톨릭대학교 지리교육과)
  • Published : 2003.12.01

Abstract

The Dokdo volcano in the south-central part of the East Sea is classified into 8 rock units. The units and sequence suggest that the Dok Island forms a small stratovolcano constructed from at least 3 times eruption cycles above the sea level and proceeded with transformation of a few different eruption styles during each cycle. Reconstruction of the volcanic form, from the geologic structures and spatial lithofacies changes, suggests that the island is remnants of the southwestern caldera rim of the stratovolcano whose central part lies several hundred meters to the northeast. The subaqueous volcano shows abig guyot, which looks like a shield volcano, that represents gentle slope at 90-175 m deep and relatively steep one in 200∼2,000m, and 25∼30km wise base on sea floor. Therefore the total Dokdo volcano represents a multiple volcano that stratovolcano with small caldera overlies the big guyot.

Keywords

Dokdo volcano;Eruption cycle;Vulcanian eruption;Stratovolcano;Multiple volcano

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