Report on Ruang (Indonesia) — 11 March-17 March 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 11 March-17 March 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Ruang (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 11 March-17 March 2015. Smithsonian Institution and US Geological Survey.
2.3°N, 125.37°E; summit elev. 725 m
All times are local (unless otherwise noted)
PVMBG reported that emissions from Ruang were unobserved during periods of clear weather from 1 January through 12 March. Seismicity increased starting on 6 March prompting PVMBG to raise the Alert Level to 2 (on a scale of 1-4) on 12 March. Residents and tourists were warned not to approach the craters within a 1.5-km radius.
Geologic Background. 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.