Pyroclastic Deposit Accumulated by Small-scale Eruptions(＜Special Section＞Volcanic History and Eruptive Deposits)

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  • 小噴火の累積でつくられた堆積物(＜特集＞堆積物による火山噴火史研究)
  • 小噴火の累積でつくられた堆積物
  • ショウ フンカ ノ ルイセキ デ ツク ラレタ タイセキブツ

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Sedimentological study of the recent deposit of Sakurajima Volcano has exposed some properties of the deposit accumulated by small-scale eruptions. Fall-out deposit of long-term such eruptive activity occur in any nearly concentric circular area around the source. Change of the small-scale eruptive activity manifests as the facies, bulk density and carbon content of the deposit, because such characters of the deposit are reflections of the accumulation rate of pyroclastics. Gray laminated or massive volcanic sand layer indicates a period of highly active volcanism ; brownish loamy volcanic sand layer a less active one and brownish loam or humic soil a dormant or inactive one. The duration of those periods can be estimated from the facies, thickness and bulk density of the deposit and recent fall-out ash data.

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