Report on Manam (Papua New Guinea) — February 1980
Scientific Event Alert Network Bulletin, vol. 5, no. 2 (February 1980)
Managing Editor: David Squires..
Manam (Papua New Guinea) Ash emission and occasional lava ejection
Please cite this report as:
Global Volcanism Program, 1980. Report on Manam (Papua New Guinea). In: Squires, D. (ed.), Scientific Event Alert Network Bulletin, 5:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198002-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
"Moderate activity occurred in January and February. Grey ash emissions from Southern crater were seen commonly in mid-January together with crater glow and occasional lava ejections. Activity weakened somewhat in February when mostly white and blue emissions were seen, and glow, with or without lava ejections, was seen on 7 nights evenly distributed through the month. Main crater was usually obscured, but grey or brown ash emissions were seen sporadically in mid-January. No sounds of eruptive activity from either vent were heard in the 2-month period."
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.
Information Contacts: C. McKee, RVO.