Report on Batu Tara (Indonesia) — 22 July-28 July 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 22 July-28 July 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Batu Tara (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 22 July-28 July 2009. Smithsonian Institution and US Geological Survey.
7.791°S, 123.585°E; summit elev. 633 m
All times are local (unless otherwise noted)
Based on analyses of satellite imagery, the Darwin VAAC reported that on 23 July an ash plume from Batu Tara rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 55 km W. On 27 and 28 July, ash plumes rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted as far away as 150 km NW.
Geologic Background. The small isolated island of Batu Tara in the Flores Sea about 50 km N of Lembata (fomerly Lomblen) Island contains a scarp on the eastern side similar to the Sciara del Fuoco of Italy's Stromboli volcano. Vegetation covers the flanks to within 50 m of the summit. Batu Tara lies north of the main volcanic arc and is noted for its potassic leucite-bearing basanitic and tephritic rocks. The first historical eruption, during 1847-52, produced explosions and a lava flow.