Dukono is a volcano located at the northernmost corner of Halmahera

Halmahera

Halmahera is the largest island in the Maluku Islands. It is part of the North Maluku province of Indonesia.Halmahera has a land area of 17,780 km² and a population in 1995 of 162,728...

 island. It has a broad profile and is capped by compound crater

Volcanic crater

A volcanic crater is a circular depression in the ground caused by volcanic activity. It is typically a basin, circular in form within which occurs a vent from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of great depth...

s. Dukono is an active volcano. During the major eruption in 1550, a lava flow filled in the strait

Strait

A strait or straits is a narrow, typically navigable channel of water that connects two larger, navigable bodies of water. It most commonly refers to a channel of water that lies between two land masses, but it may also refer to a navigable channel through a body of water that is otherwise not...

 between Halmahera and the north flank cone of Mount Mamuya. It was an eruption of scale 3 on VEI

Volcanic Explosivity Index

The Volcanic Explosivity Index was devised by Chris Newhall of the U.S. Geological Survey and Stephen Self at the University of Hawaii in 1982 to provide a relative measure of the explosiveness of volcanic eruptions....

. Deaths were reported but the figure is unknown. Smaller eruptions occurred in 1719, 1868, and 1901. Since 1933, Dukono has been erupting continuously until the present.