Report on Agung (Indonesia) — 17 January-23 January 2018
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 17 January-23 January 2018
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2018. Report on Agung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 17 January-23 January 2018. Smithsonian Institution and US Geological Survey.
8.343°S, 115.508°E; summit elev. 2997 m
All times are local (unless otherwise noted)
PVMBG reported that the eruption at Agung continued during 17-23 January, with gas-and-steam plumes rising from the crater punctuated by occasional ash emissions. An event at 2126 on 17 January generated a plume that rose 1.5 km above the crater rim and drifted E. An event was recorded at 1944 on 18 January, though fog prevented confirmation of a plume. At 1920 on 19 January a Strombolian event produced an ash plume that rose as high as 2.5 km and drifted E, and ejected incandescent material as far as 1 km from the crater. Incandescence emanated from the crater for about two hours after the event. White-to-gray plumes rose 500 m during 22-23 January. The Alert Level remained at 4 (on a scale of 1-4) and the exclusion zone continued at a 6-km radius.
Geologic Background. Symmetrical Agung stratovolcano, Bali's highest and most sacred mountain, towers over the eastern end of the island. The volcano, whose name means "Paramount," rises above the SE caldera rim of neighboring Batur volcano, and the northern and southern flanks extend to the coast. The summit area extends 1.5 km E-W, with the high point on the W and a steep-walled 800-m-wide crater on the E. The Pawon cone is located low on the SE flank. Only a few eruptions dating back to the early 19th century have been recorded in historical time. The 1963-64 eruption, one of the largest in the 20th century, produced voluminous ashfall along with devastating pyroclastic flows and lahars that caused extensive damage and many fatalities.