Report on Manam (Papua New Guinea) — March 1994
Bulletin of the Global Volcanism Network, vol. 19, no. 3 (March 1994)
Managing Editor: Richard Wunderman.
Manam (Papua New Guinea) Weak ash emission from Southern Crater
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, 19:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199403-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
"Low-level activity prevailed at Main and Southern Craters. Both craters gently emitted weak white vapour. A small ash emission from Southern Crater on 8 March was accompanied by roaring sounds and steady weak glow. This activity had ceased by 10 March. Seismic activity was at a moderate level throughout the month, although there was a steady, but small, increase starting at the time of the ash emission. Measurements from water-tube tiltmeters . . . showed slight deflation."
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.