Report on Azumayama (Japan) — February 1978
Scientific Event Alert Network Bulletin, vol. 3, no. 2 (February 1978)
Managing Editor: David Squires.
Azumayama (Japan) Continued phreatic activity
Please cite this report as:
Global Volcanism Program, 1978. Report on Azumayama (Japan) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 3:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197802-283180.
37.735°N, 140.244°E; summit elev. 1949 m
All times are local (unless otherwise noted)
Steam and ash emissions continued in January, with plumes rising 300-500 m from Oana crater.
Geologic Background. The Azumayama volcanic group consists of a cluster of stratovolcanoes, shield volcanoes, lava domes, and pyroclastic cones. The andesitic and basaltic complex was constructed in two E-W rows above a relatively high basement of Tertiary sedimentary rocks and granodiorites west of Fukushima city. Volcanic activity has migrated to the east, with the Higashi-Azuma volcano group being the youngest. The symmetrical Azuma-Kofuji crater and a nearby fumarolic area on the flank of Issaikyo volcano are popular tourist destinations. The Azumayama complex contains several crater lakes, including Goshikinuma and Okenuma. Historical eruptions, mostly small phreatic explosions, have been restricted to Issaikyo volcano at the northern end of the Higashiyama group.
Information Contacts: JMA, Tokyo; D. Shackelford, USA.