Colo is a

stratovolcano A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and p ...

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

. It forms the small island of

Una-Una Una-Una (Indonesian: Pulau Una-Una) is an Indonesian island, part of the Togian Islands in the Gulf of Tomini. Una-Una is a small volcanic island created by the Colo volcano. Its vegetation primarily consists of coconut trees. Most of the isl ...

at the middle of the

Gulf of Tomini The Gulf of Tomini ( id, Teluk Tomini), also known as the Bay of Tomini, is the equatorial gulf which separates the Minahassa (Northern) and East Peninsulas of the island of Sulawesi (Celebes) in Indonesia. The Togian Islands lie near its cent ...

, the northern part of Sulawesi. The volcano is broad and has a low profile with only above the sea level. It contains a wide

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber ...

with a small

volcanic cone Volcanic cones are among the simplest volcanic landforms. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volcanic cones are of different types, depending upon the nature ...

inside. Only three eruptions have been recorded in the history with two of them causing damage.

1898 eruption

The eruption had a VEI of 3, qualifying as 'severe'. It involved: *Central vent eruption *

Crater lake Crater Lake (Klamath: ''Giiwas'') is a volcanic crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity. The lake partly fills ...

eruption(?) *Explosive eruption *

Lahar A lahar (, from jv, ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water. The material flows down from a volcano, typically along a river valley. Lahars are extreme ...

s The island was evacuated, and there was damage to property.

1983 eruption

This eruption was more violent and had a VEI of 4. It involved: * Central vent eruption * Explosive eruption *

Pyroclastic flow A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano at average speeds of b ...

(s) * Phreatic explosion The island was evacuated, and there was damage to property, but there were no deaths.

References

{{reflist Stratovolcanoes of Indonesia Colo (volcano) Mountains of Indonesia Calderas of Indonesia 20th-century volcanic events 19th-century volcanic events

1898 eruption

1983 eruption

See also

References