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Volcano Photos

Karkar volcano, Papua New Guinea

Karkar volcano, Papua  New Guinea, Volcano photo


Karkar volcano, Papua New Guinea

An eruption plume rises above the summit of Karkar volcano in 1979.

Two nested summit calderas truncate the forested stratovolcano, giving it a broad, low profile.

The 5.5-km-wide outer caldera was formed during one or more eruptions, the last of which occurred 9000 years ago.

The 3.2-km-wide inner caldera was formed sometime between 1500 and 800 years ago.

Most historical eruptions, like this one in 1979, have originated from Bagiai cone, a pyroclastic cone constructed within the 300-m-deep inner caldera.

Karkar is a 19 x 25 km wide, forest-covered island that is truncated by two nested summit calderas.

The 5.5-km-wide outer caldera was formed during one or more eruptions, the last of which occurred 9000 years ago.

The eccentric 3.2-km-wide inner caldera was formed sometime between 1500 and 800 years ago.

Parasitic cones are present on the northern and southern flanks of basaltic-to-andesitic Karkar volcano; a linear array of small cones extends from the northern rim of the outer caldera nearly to the coast.

Most historical eruptions, which date back to 1643, have originated from Bagiai cone, a pyroclastic cone constructed within the steep-walled, 300-m-deep inner caldera.

The floor of the caldera is covered by young, mostly unvegetated andesitic lava flows.

PHOTO SOURCE: Photo by Wally Johnson, 1979 (Australia Bureau of Mineral Resources)


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