Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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TITAN2D Simulations of Pyroclastic Flows from Small Scale Eruption at Mt. Baekdusan

백두산에서 소규모 분화로 발생 가능한 화쇄류에 대한 TITAN2D 시뮬레이션 연구

  • Received : 2013.09.25
  • Accepted : 2013.11.08
  • Published : 2013.12.31
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Abstract

Many eruptions of Mt. Baekdusan volcano have been recorded in the historical literatures, and there were unrest precursors in 2002. Based on the geological survey results, it has been recognized that Mt. Baekdusan's Plinian eruptions had caused ashfall, followed by the occurrence of pyroclastic flows, which were caused by the collapse of eruption column. Therefore, we simulated the range of the impacts of pyroclastic flows, which were caused by small eruptions from a specific crater. Based on the simulation results, it can be interpreted that, when the pyroclastic flows are caused by the eruption column collapse from an eruption with less than VEI 3, the impacts will range from the outer rim of the caldera to the mountain slope 7 km at the maximum distance. Furthermore, it is interpreted that, when the eruption column occurs by the crater located inside the caldera, most will be deposited inside the caldera and what overflows will be deposited thickly mostly in the north valley, the upper stream region of Erdaobaihe.

백두산은 역사시대에 다수의 분화 기록이 있으며, 2002년도에 불안정한 전조를 나타내었다. 지질조사 결과 백두산에서는 플리니안 분화로 인하여 강하화산재 발생 후 분연주의 붕괴로 화쇄류가 발생한 것이 인지되므로, 특정 분화구로부터 소규모 분화에 의한 화쇄류의 영향 범위에 대하여 시뮬레이션 하였다. 화산폭발지수(VEI) 3 이하의 분화가 발생하여 분연주의 붕괴에 의하여 화쇄류가 발생하면 칼데라 외륜산으로부터 백두산 사면을 따라 최대 7 km까지 영향을 미칠 것으로 해석되었으며, 칼데라 내의 분화구에 의한 분연주 발생 시 대부분이 칼데라 내부에 퇴적되거나, 흘러넘칠 경우에는 주로 북쪽 이도백하 상류 계곡에 두껍게 퇴적될 것으로 파악된다.

Keywords

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