Long Island VulkanLong Island, located 136 km east of Madang in
the Vitiaz Strait, consists of 2 adjacent partly collapsed
steep-sided stratovolcanoes: Mount Reaumur in the north and
Cerisy Peak in the south. The central part of the complex
contains a large 10x12.5 km caldera filled by a lake, Lake
Wilson. The youngest eruptions have built a new cone inside the
south-central part of the caldera lake, Motmot Island, which
formed in 1953-54 and 1968. The historic eruptions in the 20th
century occurred from vents at or near Motmot Island. Long
Island volcano's eruptions are often strombolian and sometimes
submarine. Beschreibung:Collapse of the basaltic-andesitic
volcanic complex produced a large 10 x 12.5 km caldera, now
filled by Lake Wisdom. Caldera formation occurred during at
least 3 major explosive eruptions, about 16,000, 4000, and 300
years ago. The latter was one of the largest historical
eruptions in Papua New Guinea and deposited andesitic tephra
across the New Guinea highlands, prompting legends of a