South Sumatra, Suoh Volcano
summit elevation 1000 m
maars and lava dome
(Also called Pematang Bata). The volcano is located in south Sumatra.
A major earthquake (Mag 7.2) on February 15, 1994 triggered a phreatic eruption of Suoh Volcano 2 weeks later. This is the second time that this has happened at Suoh Volcano. The first was in 1933 when the volcano ejected 0.2 cubic km of tephra. The eruption formed two craters with the northernmost measuring 2 km x 1.5 km, and the southern 1 km x 0.75 km. A roaring noise came from 100 vents and the eruption was heard 660 km away in Java.
A phreatic eruption occurred at Suoh volcano on 10th July 1933, 14 days after a large earthquake in southern Sumatra. The explosions were heard in Java 660 km away. Trees were uprooted and snapped off at the roots.
Suoh Volcano Eruptions
1994, 1933 (VEI 5)
Subregion Name: Sumatra (Indonesia)
Volcano Number: 0601-27=
Volcano Type: Calderas
Volcano Status: Historical
Last Known Eruption: 1933
Summit Elevation: 1000 m 3,281 feet
Latitude: 5.25°S 5°15’0″S
Longitude: 104.27°E 104°16’0″E
The 8 x 16 km Suoh (or Suwoh) depression appears to have a dominantly tectonic origin, but contains a smaller complex of overlapping calderas oriented NNE-SSW. Historically active maars and silicic domes lie along the margins of the depression, which lies along the Great Sumatran Fault that extends the length of the island. Numerous hot springs occur along faults within the depression, which contains the Pematang Bata fumarole field. Large phreatic explosions (0.2 cu km tephra) occurred at the time of a major tectonic earthquake in 1933. Very minor hydrothermal explosions produced two 5-m-wide craters at the time of a February 1994 earthquake.