Volcanic ash falls from the Usu 2000 eruption and situation at the source area.

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  • 有珠火山2000年噴火の降灰と火口近傍の状況
  • ウス カザン 2000ネン フンカ ノ コウカイ ト カコウ キンボウ ノ ジョウキョウ

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Abstract

Volcanic ash fall distributions of four initial-stage 2000 eruptions at Usu Volcano were made. Total weight of each eruption was estimated from isopleth maps. The main axis direction for the largest eruption from 13:07 March 31 was N65°E - N30°E. The ash fall distributed more than 50 km from the vent. The total weight was 124,000 ton. The main axis direction for eruptions from 12:00 April 1 to 12:00 April 2 was N145°E. The ash fall distributed more than 25 km from the vent. The total weight was 21,000 ton. The main axis direction for a small eruption at 14:00-14:10 April 2 was N110E°. The total weight was 450 ton. The main axis direction for an eruption from 16:00 to 18:00 April 4 was N10°W - N8°E. The ash fall distributed more than 30 km from the vent. The total weight was 49,000 ton. Depositional features of the March 31 deposit were investigated near the vent area. Phreatic eruptions and their deposits at the N-B and K-B Craters were described. Ash deposits at Toyako Spa area were also described.

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