1988〜1989年十勝岳噴火の火山灰層位学的研究 : 特集: 十勝岳1988~1989年噴火

書誌事項

タイトル別名
  • Tephra-stratigraphical Study of the 1988-1989 Eruptions of Tokachi-dake Volcano, Central Hokkaido. : Special Section: The 1988-1989 Eruption of Mt・ Tokachi, Central Hokkaido
  • 1988~1989年十勝岳噴火の火山灰層位学的研究〔英文〕
  • 1988 1989ネン トカチダケ フンカ ノ カザンバイ ソウイガクテキ ケ

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説明

Twenty-three small-scale eruptions took place at Tokachi-dake from December 16, 1988 to March 5, 1989. The pyroclastic fall deposits, ballistic fragments, and pyroclastic surge and flow deposits were dispersed over the flank and leeward areas of the volcano. Because the pyroclasts of each eruption were well-preserved in snow during the winter, the stratigraphy and distribution of these deposits could be studied in detail. The volume of the pyroclastic fall deposits are nearly equal to those of the pyroclastic surge and flow deposits. The total volume of these pyroclasts is estimated to be 7.4×105 m3. Judging from the sequential changes of the volume and composition of the pyroclasts, the characteristic features of the eruption can be summarized as follows: At first, a vent was opened by ejection of altered rock fragments in December, 1988. Then, essential fragments were ejected in January, 1989. Finally the activity level of magma declined and the altered rock fragments content increased again in February to March, 1989.

収録刊行物

  • 火山.第2集

    火山.第2集 35 (2), 131-145, 1990

    特定非営利活動法人 日本火山学会

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