Report on Manam (Papua New Guinea) — October 1978
Scientific Event Alert Network Bulletin, vol. 3, no. 10 (October 1978)
Managing Editor: David Squires.
Manam (Papua New Guinea) Ash ejection begins from Main Crater and continues from South Crater
Please cite this report as:
Global Volcanism Program, 1978. Report on Manam (Papua New Guinea) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 3:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197810-251020.
Papua New Guinea
4.08°S, 145.037°E; summit elev. 1807 m
All times are local (unless otherwise noted)
Small amounts of ash were emitted from Southern crater on most days in October. Incandescent fragments were seen briefly on 3 nights. Ash ejection from Main crater began in mid-October, and glow was seen there late in 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: R. Cooke, RVO.