See PMB 1294 Information Sheet for notes on RVO administrative history.
The Rabaul Volcanological Observatory Observatory is responsible for monitoring the activity of the 14 active and 23 dormant volcanoes spread along three volcanic arcs throughout Papua New Guinea and which have produced more than 140 eruptions in the last 200 years. Monitoring is carried out at RVO, 6 "outstation" observatories (Manam, Karkar, Langila, Ulawun, Esa'ala, and Lamington volcanoes) and an unmanned telemetered station (Lamington).
In addition to volcano monitoring, the functions of the Rabaul Volcano Observatory include: geologic reconnaissance and tephrastratigraphic studies (e.g. at Rabaul, Loloru, Hargy and Witori), volcanic hazard assessments (e.g. Rabaul, Manam, Karkar, Langila, Ulawun, Balbi, Bagana, Loloru, Lamington, Victory), assistance in the preparation and revision of volcano emergency plans (e.g. Rabaul, Manam, Ulawun), and applied research on the pattern of activity of the monitored volcanoes with a view to the detection of eruption precursors and provision of warnings.
From World Organisation of Volcanic Obsrvatories website: http://volcano.und.edu/vwdocs/wovo/southeast_asia/rabaul.html

Selected files of reports, observations and correspondence held in the RVO administrative file series, “Volcanological Records”, on the following sites: Bam Island, Manam Volcano, Long Island, Mt Bagana, Mt Lamington, Fergusson island, Esa’ala Station, D’Entrecasteaux Islands, Biniguni Hot Springs, Mt Langila, East and West New Brirtain. Original file numbers have been cited where identified.
See Finding aids for details.