Report on Manam (Papua New Guinea) — February 1995
Bulletin of the Global Volcanism Network, vol. 20, no. 2 (February 1995)
Managing Editor: Richard Wunderman.
Manam (Papua New Guinea) Activity continues to decrease; weak vapor emissions
Please cite this report as:
Global Volcanism Program, 1995. Report on Manam (Papua New Guinea). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 20:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199502-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
"Activity during February decreased further from January levels. Both South and Main craters released weak white vapours in low to moderate volumes. One explosion from South Crater on 19 February emitted a grey cloud, and a weak glow was seen on the night of the 24th. Seismicity was low during the first half of February, but increased somewhat during the 2nd and 3rd weeks. No significant change was shown by the water-tube tiltmeter 4 km SW of the summit."
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: P. de Saint-Ours, R. Stewart, and B. Talai, RVO.