Niigate-yake-yama

SUMMARY:

Type: dome
Activity: active
Last Eruption: 1989 AD
Rock Type: ?
Eruptive Volume: ? cu km
Location Map from Xerox PARC
Latitude: 36.92 N
Longitude: 138.03 E

GEOLOGIC HISTORY

The Volcano is a 400-m-high lava dome that rests on 2000-m-high mountains underlain by sedimentary rocks. Several large pyroclastic flow eruptions are known in the past 1100 years.

Historic Activity: Its last eruption was a phreatic explosion from fissures in the N and W flanks on July 28, 1974. Ash fell as far as 100 km to the NE.

Recent Activity:

• A white steam plume was present from May 1987 to September 1988.
• Steam emission returned in late March 1989 with minor ash emissions in April 1989.

Data Sources

• Smithsonian's SEAN Bulletin (V. 8, No. 4 and V. 14, No. 4)
• Global Volcanism Network (V. 16, No. 12 and V. 17, No. 12).

ADDITIONAL INFORMATION

Last Update: 2/27/00