PPT Slide

First Eruption, Nishi-yama Crater, West foot1:10pm Mar. 31 2000

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�A

Mt. ShowaShinzan

�B

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Lake Toya

2000 Eruption of Usu Volcano

Eruption of Konpira-yama Crater: Apr. 1, 2000 North West foot

Toyako-Onsen Spa.(town) is several hundred meters in distance.

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Taken from a helicopter Self-Defense Forceby Profe. Ui, Hokkaido Univ.

Mt. Usu

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Central Date

Central Abuta

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�B

Central Sobetsu

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Toyako Onsen Spa.

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4 km from summit

- 6 -

・Frequent volcanic seismic activities

・Few volcanic tremors

・Number of seismic activities big enough to be felt by people: 1,216times,　March27〜July16

・Eruptions :

・Magma phreatic eruption occurred along a line of volcanic craters around the base of Mount Usu.

These craters were formed by the recent seismic activities. The column of smoke from the eruptions reached 3,200 meters and blew to the East. (13:10, March 31)

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