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Report on Manam (Papua New Guinea) — 20 February-26 February 2002

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 February-26 February 2002
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2002. Report on Manam (Papua New Guinea). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 20 February-26 February 2002. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (20 February-26 February 2002)


Manam

Papua New Guinea

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

All times are local (unless otherwise noted)


Mild eruptive activity was observed at Manam during January through late February. Beginning on 13 January weak puffs of ash clouds were emitted from Southern Crater at 5-10 minute intervals. On several days in January fine ash fell on the NE side of the island for periods of several hours. During 8-24 February ash fell to the SE and was occasionally deposited in Warisi village. Main Crater released only weak-to-moderate volumes of white vapor during the report period. No instrumental measurements were made.

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.

Source: Rabaul Volcano Observatory (RVO)