Report on Manam (Papua New Guinea) — February 1996
Bulletin of the Global Volcanism Network, vol. 21, no. 2 (February 1996)
Managing Editor: Richard Wunderman.
Manam (Papua New Guinea) Steam emitted at low-to-moderate rates
Please cite this report as:
Global Volcanism Program, 1996. Report on Manam (Papua New Guinea). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 21:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199602-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
During January and February both summit craters emitted white vapors at low to moderate rates. While activity at Manam was very subdued in February, S Crater released blue emissions on two days (11-12 February) and weak booming noises were heard during the month. Neither ash emissions nor increased white vapor emissions were noted at the time of the sound effects.
No seismic monitoring took place at Manam during February. Tilt measurements from the water-tube tilt meters at Tabele Observatory (4 km from the summit) indicated little or no tilt for the month.
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: RVO.