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Report on Manam (Papua New Guinea) — 8 December-14 December 2004

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 8 December-14 December 2004
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2004. Report on Manam (Papua New Guinea). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 8 December-14 December 2004. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (8 December-14 December 2004)


Manam

Papua New Guinea

4.08°S, 145.037°E; summit elev. 1807 m

All times are local (unless otherwise noted)


RVO reported to the Darwin VAAC that during 8-14 December moderate eruptions continued at Manam. Satellite imagery showed a plume at a height of ~4.6 km a.s.l. extending ~220 km ENE. According to a news report, by 11 December more than 3,000 of the island's 9,000 residents had been evacuated.

Geologic Background. The 10-km-wide island of Manam, lying 13 km off the northern coast of mainland Papua New Guinea, is one of the country's most active volcanoes. Four large radial valleys extend from the unvegetated summit of the conical 1807-m-high basaltic-andesitic stratovolcano to its lower flanks. These "avalanche valleys" channel lava flows and pyroclastic avalanches that have sometimes reached the coast. Five small satellitic centers are located near the island's shoreline on the northern, southern, and western sides. Two summit craters are present; both are active, although most historical eruptions have originated from the southern crater, concentrating eruptive products during much of the past century into the SE valley. Frequent historical eruptions, typically of mild-to-moderate scale, have been recorded since 1616. Occasional larger eruptions have produced pyroclastic flows and lava flows that reached flat-lying coastal areas and entered the sea, sometimes impacting populated areas.

Sources: ABC News - Australian Broadcasting Corporation, Darwin Volcanic Ash Advisory Centre (VAAC)