Documentation of Izu-Oshima 1986 Eruption Phase 2 Revealed by TV Reports

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  • テレビ報道の解析による1986年伊豆大島噴火 Phase2 の記述
  • テレビ ホウドウ ノ カイセキ ニ ヨル 1986ネン イズ オオシマ フンカ

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Abstract

Izu-Oshima volcano erupted at about 17:20 hours on November 15, 1986, after 12 years quiescence. The first eruptive activity, phase 1, was restricted to fire fountaining and overflow of lave from the south part of Mihara crater (A crater). The phase 2 eruption began at 16:15 hours on November 21, on the caldera floor. In this phase, fissure eruptions took place on the caldera floor (B craters) at 16:15 hours and another on the northwest slope of the somma (C craters) at 17:46 hours. The A crater activated again at 16:44 hours. Coarse scoria fell on the eastern coast of the island from subplinian column on B craters. Lavas from B craters spread on the caldera floor and another lava heading to Motomachi town streamed down from one of C craters. The eruption of C, B and A craters lasted until about 21:00 hours on 21, 01:00 hours on 22 and 04:30 hours on 22 respectively. The whole sequence of phase 2 eruption was broadcasted by television and informed also by other mass communications. In this report, documentation of phase 2 is presented based on these media. Merits and limits of mass media especially TV reports for documentation of eruption are discussed.

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