Report on Manam (Papua New Guinea) — January 1993
Bulletin of the Global Volcanism Network, vol. 18, no. 1 (January 1993)
Managing Editor: Lindsay McClelland.
Manam (Papua New Guinea) Activity remains low; weak vapor emissions
Please cite this report as:
Global Volcanism Program, 1993. Report on Manam (Papua New Guinea). In: McClelland, L (ed.), Bulletin of the Global Volcanism Network, 18:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199301-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
"Low level activity continued at S Crater. Emissions consisted of weak vapour, occasionally with light ash content. Weak fluctuating glow was seen above the crater every night of January after the 5th. Main Crater released a thin to moderately thick plume of white vapour. Seismicity consisted of discontinuous low-amplitude tremor and low-frequency events of small amplitude throughout the month. Tiltmeter measurements showed no trends."
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: R. Stewart, P. de Saint-Ours, and C. McKee, RVO.