Report on Batur (Indonesia) — November 1989
Scientific Event Alert Network Bulletin, vol. 14, no. 11 (November 1989)
Managing Editor: Lindsay McClelland.
Batur (Indonesia) Thermal activity
Please cite this report as:
Global Volcanism Program, 1989. Report on Batur (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 14:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198911-264010.
8.242°S, 115.375°E; summit elev. 1717 m
All times are local (unless otherwise noted)
A thin white plume rose 2-10 m from the solfatara field in the N wall of the crater. Gases emerged with a weak hissing sound and had temperatures of 40-80°C in 27° air. Other solfataras emitted 2-5-m white plumes at 90-95°C. Seismic stations recorded one local and 26 distant tectonic events, and one volcanic earthquake in November.
Geologic Background. The historically active Batur is located at the center of two concentric calderas NW of Agung volcano. The outer 10 x 13.5 km wide caldera was formed during eruption of the Bali (or Ubud) Ignimbrite about 29,300 years ago and now contains a caldera lake on its SE side, opposite the satellitic Gunung Abang cone, the topographic high of the complex. The inner 6.4 x 9.4 km wide caldera was formed about 20,150 years ago during eruption of the Gunungkawi Ignimbrite. The SE wall of the inner caldera lies beneath Lake Batur; Batur cone has been constructed within the inner caldera to a height above the outer caldera rim. The Batur stratovolcano has produced vents over much of the inner caldera, but a NE-SW fissure system has localized the Batur I, II, and III craters along the summit ridge. Historical eruptions have been characterized by mild-to-moderate explosive activity sometimes accompanied by lava emission. Basaltic lava flows from both summit and flank vents have reached the caldera floor and the shores of Lake Batur in historical time.
Information Contacts: VSI.