Report on Ontakesan (Japan) — December 1979
Scientific Event Alert Network Bulletin, vol. 4, no. 12 (December 1979)
Managing Editor: David Squires.
Ontakesan (Japan) Vapor emission declines; local earthquakes continue
Please cite this report as:
Global Volcanism Program, 1979. Report on Ontakesan (Japan) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 4:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197912-283040
35.893°N, 137.48°E; summit elev. 3067 m
All times are local (unless otherwise noted)
In the 2 months since the 1-day eruption of 28 October, no ash ejection has been observed and vapor emission has declined. At the end of December, the vapor column was only 100 m high.
About 10 local seismic events per day have been recorded since instruments were installed [on 29 October]. Epicenters have been distributed along a sharply defined narrow linear zone extending about 2 km N-S on the SE flank. Earthquakes had been felt in the area for about 2 years, but the number of felt events declined to about 1 per week after the eruption.
Geological Summary. The massive Ontakesan stratovolcano, the second highest volcano in Japan, lies at the southern end of the Northern Japan Alps. Ascending this volcano is one of the major objects of religious pilgrimage in central Japan. It is constructed within a largely buried 4 x 5 km caldera and occupies the southern end of the Norikura volcanic zone, which extends northward to Yakedake volcano. The older volcanic complex consisted of at least four major stratovolcanoes constructed from about 680,000 to about 420,000 years ago, after which Ontakesan was inactive for more than 300,000 years. The broad, elongated summit of the younger edifice is cut by a series of small explosion craters along a NNE-trending line. Several phreatic eruptions post-date the roughly 7300-year-old Akahoya tephra from Kikai caldera. The first historical eruption took place in 1979 from fissures near the summit. A non-eruptive landslide in 1984 produced a debris avalanche and lahar that swept down valleys south and east of the volcano. Very minor phreatic activity caused a dusting of ash near the summit in 1991 and 2007. A significant phreatic explosion in September 2014, when a large number of hikers were at or near the summit, resulted in many fatalities.
Information Contacts: JMA, Tokyo.