Generation of Merapi-type Pyroclastic Flows : Observations of the 6th Dome of Unzen volcano, Japan

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  • メラピ型火砕流の発生過程 : 雲仙普賢岳第6ドームでの観測結果
  • メラピガタ カサイリュウ ノ ハッセイ カテイ ウンゼン フゲンダケ ダイ 6

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Small-scale pyroclastic flows due to the collapse of the lava dome have been frequently generated during the 1991-93 eruption of Unzen Volcano. We have recorded video footages which show the generation of pyroclastic flows during January-March 1992. Two types of phenomena have been observed : deformation of the lava dome due to flowage ; and a sudden discharge of gas and ash through fractures and peeling-off of rock fragments from the surface of cooling lava blocks. Pyroclastic flows were generated only in places on the lava dome where these precursory phenomena were frequently observed.

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