論文

査読有り 本文へのリンクあり 国際誌
2019年12月1日

Shallow magma pre-charge during repeated Plinian eruptions at Sakurajima volcano

Scientific Reports
  • Naoki Araya
  • ,
  • Michihiko Nakamura
  • ,
  • Atsushi Yasuda
  • ,
  • Satoshi Okumura
  • ,
  • Tomoki Sato
  • ,
  • Masato Iguchi
  • ,
  • Daisuke Miki
  • ,
  • Nobuo Geshi

9
1
開始ページ
1979
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41598-019-38494-x

© 2019, The Author(s). Vigorous explosive eruptions that produce continuous high eruption plumes (Plinian eruptions) are generally assumed to tap a magma reservoir. The 1914 Plinian eruption at the Sakurajima volcano located on the Aira caldera rim is one such case, where the main magma reservoir was assumed to be located approximately 10 km beneath the caldera. However, we report that estimated magma storage depths immediately prior to the eruption were much shallower (0.9–3.2 km) on the basis of pressure at which volatiles within the phenocryst melt inclusions and plagioclase rims were finally equilibrated. The same is observed for two historic Plinian eruptions in 1471 and 1779. This depth is even shallower than the shallowest magma reservoir estimated from the pressure source for geodetic deformation during recent Vulcanian explosions (4 km beneath the crater). We propose that the magmas were fed from a thick conduit pre-charged from deeper reservoirs. The ground subsidence observed after 1914 within the Aira caldera may have been caused by conduit recharge following the eruption. Voluminous conduit recharge could be key to forecasting the next possible large eruption at the Sakurajima volcano.

リンク情報
DOI
https://doi.org/10.1038/s41598-019-38494-x
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/30760833
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85061499956&origin=inward 本文へのリンクあり
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85061499956&origin=inward
ID情報
  • DOI : 10.1038/s41598-019-38494-x
  • eISSN : 2045-2322
  • PubMed ID : 30760833
  • SCOPUS ID : 85061499956

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