Monday, May 06, 2013
An explosion produced an ash plume rising to 7,000 ft (2.1 km) altitude today. [more]
Monday, Apr 29, 2013
New explosions have produced ash plumes rising to 7,000 ft (2.1 km) altitude this morning. [more]
Batu Tara volcanoBatu Tara is a small island volcano 50 km north of Lembata Island in the Flores Sea. It is frequently active, producing ash eruptions rising to hundreds or few kilometers elevation.
Background:Batu Tara island is the top of a larger stratovolcano, its base reaching 3000 meters below sea level. It has a large central summit crater of 900 x 700 meters diameter open to the east.
The scar on its eastern side is a flank collapse feature similar to the Sciara del Fuoco of Italy's Stromboli volcano. Vegetation covers the flanks of Batu Tara to within 50 m of the 748-m-high summit.
Batu Tara lies on young and thin oceanic crust north of the main volcanic Sunda-Banda Arc at the boundary of the collision of the north moving Australian with the Sunda tectonic plate. Geochemically, it is noted its potassic leucite-bearing basanitic and tephritic rocks.
Eruptions from Batu Tara
Until 2006, the only confirmed historical eruption from Batu Tara were during 1847-52, which produced explosions with volcanic bombs and a lava flow.
On July 1st, 2006, Batu Tara was observed erupting again. An ash plume rose to 5000 ft (ca 2 km). Since then, it has been erupting frequently. Most eruptions were strombolian or vulcanian type, with explosions producing ash plumes of 1-2 km, similar to Anak Krakatau's activity.
In March 2007, a phase of stronger eruptions promted the evacuation of 15000 people from Lembata Island nearby.
Batu Tara eruption videoThe following video was taken by Richard Roscoe during our Batu Tara expedition in November 2012 and shows the typical strombolian activity of the volcano we observed from close range: