Distribution and Timing of Effusion of the Secondary Lava Flows of the Taisho Eruption(1914-1915), Sakuraiima Volcano

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  • WATANUKI Yoko
    Graduate School of Human and Environmental Studies, Kyoto University : Present address:Applied Technology Co. Ltd.
  • KAMATA Hiroki
    Graduate School of Human and Environmental Studies, Kyoto University
  • MIKI Daisuke
    Sakurajima volcano Research Center, Disaster Prevention Research lnstitute, Kyoto University
  • ISHIHARA Kazuhiro
    Sakurajima volcano Research Center, Disaster Prevention Research lnstitute, Kyoto University

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  • 桜島火山大正噴火における二次溶岩流の分布と流出時期
  • サクラジマ カザン タイショウ フンカ ニ オケル 2ジ ヨウガンリュウ ノ ブンプ ト リュウシュツ ジキ

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Abstract

During the Taisho Eruption (1914-1915) of Sakurajima Volcano, the Secondary Lava Flows drained out from the front of the primary lava flows after a certain pause from their settlement. We investigate distribution, timing and conditions of the effusion of the Secondary Lava Flows which have not been clarified yet. We define the features of the Secondary Lava Flows by means of geomorphological interpretation using aerial photographs and field survey. More than 200 landscape photographs, which were taken at the time of the Taisho Eruption, indicate that the earliest Secondary Lava Flows effused on 14 February 1914; this date was several months earlier than those previously considered. The effusing of the Secondary Lava Flows did not occur as a single event but as several events in different areas. Based on volumetric estimation of the individual Secondary Lava Flows, the volume of the Secondary Lava Flows tend to have increased as time passed after the eruption. The Secondary Lava Flows effused from the underlying tip of river valleys.

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