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![Colo [Una Una] Volcano, Indonesia, Volcano photo](colo_una_una_volcano_indonesia_photo.jpg)
Colo [Una Una] Volcano, Indonesia
Ash mantles the summit of Colo volcano after a powerful explosive eruption in 1983.
The volcano forms the isolated island of Una-Una in the middle of the Gulf of Tomini in northern Sulawesi.
The broad, low volcano is truncated by a 2-km-wide caldera that contains a small central cone.
Only three eruptions have been recorded in historical time.
The last eruption, in 1983, produced pyroclastic flows that swept over most of the island shortly after all residents had been evacuated.
Colo volcano forms the isolated small island of Una-Una in the middle of the Gulf of Tomini in northern Sulawesi.
The broad, low volcano, whose summit is only 507 m above sea level, contains a 2-km-wide caldera with a small central cone.
Only three eruptions have been recorded in historical time, but two of those caused widespread damage over much of the island.
More recent work has revealed thick young pumice deposits mineralogically and chemically similar to the White River Ash deposits along the rim of the Mount Churchill caldera.
The last eruption, in 1983, produced pyroclastic flows that swept over most of the island shortly after all residents had been evacuated.
PHOTO SOURCE: M.S. Santoso, 1983 (Volcanological Survey of Indonesia), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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