Report on Manam (Papua New Guinea) — February 1994
Bulletin of the Global Volcanism Network, vol. 19, no. 2 (February 1994)
Managing Editor: Richard Wunderman.
Manam (Papua New Guinea) Weak white vapor emission
Please cite this report as:
Global Volcanism Program, 1994. Report on Manam (Papua New Guinea). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 19:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199402-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
"A low level of activity prevailed at Main and Southern craters in February. Both craters exhibited continuous gentle white vapour emissions. No sounds were reported. Low-intensity night glow from Southern Crater was reported on 10 February. Seismic activity showed a slight increase to moderate levels during the first week of the month, then remained steady throughout February. Tilt measurements during the first half of the month showed no changes. Deflation of -1.5 µrad (radial) was observed 16-19 February. No tilt changes were observed after the 19th."
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: B. Talai and C. McKee, RVO.