Report on Egon (Indonesia) — 25 August-31 August 2004
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 25 August-31 August 2004
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2004. Report on Egon (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 25 August-31 August 2004. Smithsonian Institution and US Geological Survey.
8.676°S, 122.455°E; summit elev. 1661 m
All times are local (unless otherwise noted)
According to news articles, increased volcanic activity at Egon on 31 August led people from at least seven villages near the volcano to temporarily evacuate their homes. Local officials feared that about 2,000 people living on the mountainside were at risk. Reportedly, activity decreased after a few hours and most villagers returned home.
Geologic Background. Gunung Egon, also known as Namang, sits within the narrow section of eastern Flores Island. The barren, sparsely vegetated summit region has a 350-m-wide, 200-m-deep crater that sometimes contains a lake. Other small crater lakes occur on the flanks. A lava dome forms the southern summit. Solfataric activity occurs on the crater wall and rim and on the upper S flank. Reports of eruptive activity prior to explosive eruptions beginning in 2004 are unconfirmed. Emissions were often observed above the summit during 1888-1892. Strong emissions in 1907 reported by Sapper (1917) was considered by the Catalog of Active Volcanoes of the World (Neumann van Padang, 1951) to be an historical eruption, but Kemmerling (1929) noted that this was likely confused with an eruption on the same date and time from Lewotobi Lakilaki.