Dieng Volcanic Complex, Central Java, Indonesia
Location: 7.2S, 109.9E
Elevation: 8,400 feet (2,565 m)
Last Update: September 26, 2003
This information was summarized from the GVP/USGS
Weekly Volcanic Activity Report
August 5, 2003
The temperature of the crater on 21 July was 74°C, which had not increased
much since last measured. The next day, the Alert Level was raised to 2 (on
a scale of 1-4) and on 24 July at 0730 mud flowed as far as 50 m from the crater
towards the N and E. Mud bubbled up to 1 m high in the center of the crater.
The crater remained closed to tourists.
Dieng Volcanic Complex (also called the Dieng Plateau) is a complex volcano.
A complex volcano is an extensive assemblage of spatially, temporally, and
genetically related major and minor volcanic centers with their associated
lava flows and pyroclastic rocks (Francis, 1994). The Dieng Volcanic
Complex forms a large depression about 9 miles (14 km) long and about 4
miles (6 km) wide and elongated in a northwest-southeast direction. This
larger structure may be a caldera associated with the relics of two or more
stratovolcanoes. However, no large volume deposit(s) associated with a
caldera-forming event have been identified. If a caldera is involved it is
older than 16,000 years. Sketch map of Dieng Plateau and caldera from
Newhall and Dzurisin (1988) and modified from Delarue (1980).
Within the complex are numerous cones, many of which are 30-100 feet
(100-300 m) high. Most cones are made of cinders or ash. Lava flows are
less common. This photo shows Kawah Sibanteng, one of the larger cones in
the Dieng complex. All photos by Steve Mattox.
Telaga Warna is a lake within a broad, low-relief cone. Gas bubbles are
seen rising to the surface of the lake and the air has a sulfurous odor.
Terraced fields along the southeast margin of the Dieng Volcanic Complex.
Potatoes are a common crop on the plateau.
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