Lamington

Geography & Climate

Lamington is located in Papua New Guinea, within the Trobriand Volcanic Province of the broader Southwestern Pacific Volcanic Regions. Situated at 8.95° S, 148.15° E in the Southern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 1,680 meters above sea level, Lamington is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a composite, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Lamington sits in a subduction zone, where one tectonic plate dives beneath another, creating intense heat and pressure that generates magma. Subduction zones are responsible for many of the world's most explosive volcanoes and deadliest eruptions. For communities in Papua New Guinea near Lamington, this tectonic setting means the volcano is capable of producing powerful explosive eruptions, pyroclastic flows, and lahars that can threaten populated areas within tens of kilometers of the summit. The dominant rock type is andesite / basaltic andesite, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.

Eruption History Summary

Lamington has 3 recorded eruptions in the geological database, spanning from 5980 BCE to 1951 CE. The most powerful recorded event was a cataclysmic eruption with ash columns reaching the stratosphere in 1951 CE, reaching VEI 4 on the Volcanic Explosivity Index. These eruptions span roughly 7,931 years of volcanic history. The most recent eruption in 1951 CE places this volcano within the modern era of volcanological observation.

Significance

With a maximum recorded VEI of 4, Lamington has demonstrated the capacity for significant explosive eruptions that can impact regional aviation, agriculture, and communities tens of kilometers from the summit. VEI 4 eruptions produce ash columns reaching 15-25 kilometers into the atmosphere. Given its recent activity, Lamington is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

Lamington is an andesitic stratovolcano with a 1.3-km-wide breached summit crater containing a lava dome that rises above the coastal plain of the Papuan Peninsula of New Guinea north of the Owen Stanley Range. A summit complex of lava domes and crater remnants tops a low-angle base of volcaniclastic deposits dissected by radial valleys. A prominent broad "avalanche valley" extends northward from the breached crater. Ash layers from two early Holocene eruptions have been identified. In 1951 a powerful explosive eruption produced pyroclastic flows and surges that swept all sides of the volcano, killing nearly 3,000 people. The eruption concluded with growth of a 560-m-high lava dome in the summit crater.

— Smithsonian Institution, Global Volcanism Program