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Report on Ruang (Indonesia) — 18 September-24 September 2002


Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
18 September-24 September 2002
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2002. Report on Ruang (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 18 September-24 September 2002. Smithsonian Institution and US Geological Survey.

Weekly Report (18 September-24 September 2002)



2.3°N, 125.37°E; summit elev. 725 m

All times are local (unless otherwise noted)

VSI increased the Alert Level at Ruang to 4 (the highest level) when the volcano began to erupt on 25 September at 0100. During the 7-hour eruption an ash cloud rose 0.5-1 km above the summit. Ruang erupted again at 1140, producing an ash cloud that VSI reported rose to 5 km above the summit. According to the Darwin VAAC, satellite imagery revealed that an ash cloud reached ~16 km above the volcano. People living near the volcano at desa Pumpente and desa Laimpatehi were evacuated.

Geological Summary. Ruang volcano, not to be confused with the better known Raung volcano on Java, is the southernmost volcano in the Sangihe Island arc, north of Sulawesi Island. The 4 x 5 km island volcano rises to 725 m across a narrow strait SW of the larger Tagulandang Island. The summit contains a crater partially filled by a lava dome initially emplaced in 1904. Explosive eruptions recorded since 1808 have often been accompanied by lava dome formation and pyroclastic flows that have damaged inhabited areas.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)