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Latest news:
Sundoro volcano (Central Java, Indonesia) activity update: seismic activity decreased, alert lowered back to "normal" (1 out of 4)
Thursday, Apr 05, 2012
Seismicity at Sundoro continued to increase into January after the Alert Level was raised from 1 to 2 (on a scale of 1-4) on 5 December 2011. After th... [more]
Sundoro volcano (Central Java, Indonesia) activity update: increased seismic activity, steaming
Saturday, Dec 10, 2011
Sundoro volcano in central Java, Indonesia, is becoming restless and the Indonesian Volcanologic Survey raised its alert level to 2 (out of 4) on 6 De... [more]

Sundoro volcano

stratovolcano 3136 m / 10,289 ft
Central Java, Indonesia, -7.3°S / 109.99°E
Current status: dormant (1 out of 5)
last update: 5 Apr 2012 (seismic activity decreased, alert lowered back to "normal" (1 out of 4))
Typical eruption style: Explosive
Sundoro volcano eruptions: Merapi (left) with Sumbing (center) and Sundoro (right) volcanoes in Central Java seen from the east.
Sundoro, a perfect stratovolcano, in Central Java is located close to Sumbing volcano and separated by the latter by a 1400-m-high saddle only.
Historic activity at Sundoro, who last erupted 1971, consisted mainly in small to medium phreatic eruptions from its many summit craters (Segoro Wedi, Segoro Banjaran, Kawah Utara, Kawah Selatan and Sumur Ledakan), and from flank vents (1882 and 1903).

Background:

Many parasitic craters and cones, the largest of which is Kembang, occur on the NW-to-southern flanks, and all fed lava flows. A small lava dome occupies the summit crater of the 3136-m-high volcano, and numerous phreatic explosion vents were formed along radial fissure that cut the dome and extend across the crater rim.
Lava flows extend in all directions from the summit crater. Deposits of a large prehistoric debris avalanche are located below the NE flank of Sundoro. Pyroclastic-flow deposits dated at 1720 years before present extend as far as 13 km from the summit.
Source: GVP Sundoro information