論文

査読有り
2012年5月15日

Decompression rate of magma at fragmentation: Inference from broken crystals in pumice of vulcanian eruption

Journal of Volcanology and Geothermal Research
  • Takahiro Miwa
  • ,
  • Nobuo Geshi

227-228
開始ページ
76
終了ページ
84
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jvolgeores.2012.03.003
出版者・発行元
Elsevier BV

Decompression rate of magma at fragmentation (immediately before or after fragmentation) was determined using broken crystals found in the pumices ejected during the vulcanian explosion of Sakurajima volcano, Japan. The combined analysis of textural data obtained from the natural pumice samples and a simple model for the crystal fracturing in vesiculating viscous magma indicated a decompression rate 7.0×10 3-7.8×10 4Pa/s for the ejecta produced during the later phase of vulcanian explosion. This result suggests that the short duration of the vulcanian explosion is controlled by the rapid decrease of the magma ascent rate to a vent. An understanding of the control mechanism of the termination of an eruption by precise prediction of the eruption process is essential for both volcanology and hazard mitigation. © 2012 Elsevier B.V.

リンク情報
DOI
https://doi.org/10.1016/j.jvolgeores.2012.03.003

エクスポート
BibTeX RIS