In 2004, volcanic eruptions occurred at six volcanoes. No persons were injured. At Miyakejima volcano, high SO2 flux still continued and all of the inhabitants were evacuating out of the island. But they started to return to the island since February 2005.
Following 6 active volcanoes erupted in 2004. The activity shown here is as of January 2005.
Very small eruptions were oberved in February and April .
Asamayama (Nagano, Gunma)
Explosive eruptions were oberved since September 1. Asama page
Small eruptions were observed since November to December. High volcanic gas flux still continued. SO2 flux is decreasing in the long run and the present flux is 2000-5000 ton/day. Miyake page
Vulcanian eruptive activity is still continueing. 11 explosions occurred in 2004.
Satsuma-Iwojima(Kagoshima, Tokara islands)
Many small volcanic earthquakes were observed. Volcanic tremors and ash falls were observed.
Suwanosejima(Kagoshima, Tokara islands)
Active eruption and seismic activity continued.
Other phenomena at active volcanoes in Japan
Aso (Kumamoto): Volcanic tremors and high temparature in the crater
Kirishima (Kagoshima, Miyazaki): Volcanic tremors and fumarole at Ohachi crater
Meakan, Tarumae (Hokkaido) : High temparature in the crater
Hokkaido-Komagadake (Hokkaido) : Inflation continued
Kuchinoerabu (Kagoshima), Izu (Shizuoka), Izu-oshima (Izu islands), Hakone (Kanagawa) : Seismic activity
Kusatsu-Shiranesan (Gunma) : Disclored water in the crater lake
Fuji (Shizuoka, Ymanashi) : Low frequency earthquakes
Discolored water areas were detected at some submarine volcanoes.
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