GEOLOGIC HISTORY
Asama, Honshu's most active volcano, is located at the
junction of the Izu-Marianas and NE Japan arcs.
Historic Activity: Asama has a historical record
dating back more than 1,300 years.
Recent Activity:
- The April 26, 1982 eruption produced a small
pyroclastic flow and ashfall that reached the Pacific
coast (about 200 km E of the volcano). The eruption of
Oct. 2, 1982 casused crop damage. The April 8, 1983
eruption produced ashfall that also reached the Pacific
coast (250 km). Increased seismic activity and steam
emissions from March to September 1990. Small ash
eruptions occurred on July 20, 1990.
- Increased seismic activity began in April 1995 and
continued through June.
- Increased seismic activity in June thru Nov.
1996.
Data Sources
- Smithsonian's SEAN Bulletin (V. 8, No. 3 to V. 13,
No. 8)
- Global Volcanism Network (V. 15, No. 5 to V. 21, No.
11).
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