Lokon-Empung

Geography & Climate

Lokon-Empung is located in Indonesia, within the Sangihe Volcanic Arc of the broader Western Pacific Volcanic Regions. Situated at 1.36° N, 124.80° E in the Northern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 1,580 meters above sea level, Lokon-Empung 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

Lokon-Empung 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 Indonesia near Lokon-Empung, 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 basalt / picro-basalt, 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

Lokon-Empung has 20 recorded eruptions in the geological database, spanning from 1963 CE to 2015 CE. The most powerful recorded event was a severe eruption capable of regional ash fall and pyroclastic flows in 2003 CE, reaching VEI 3 on the Volcanic Explosivity Index. Notable eruptions include 2003 CE (VEI 3), 1991 CE (VEI 3). With an average interval of roughly 3 years between eruptions over a span of 52 years, this is one of the more frequently active volcanoes in the database. This persistent activity suggests a robust and well-supplied magma system beneath the volcano. With eruptive activity as recently as 2015 CE, Lokon-Empung remains an actively monitored volcano.

Significance

With a maximum recorded VEI of 3, Lokon-Empung has produced eruptions capable of generating pyroclastic flows and significant ash fall in the surrounding area. While not among the largest eruptions globally, VEI 3 events pose serious hazards to local populations and can disrupt regional air travel. Its 20 recorded eruptions make it one of the most prolific volcanoes in our database, reflecting a persistent and well-documented eruptive history that has provided volcanologists with extensive data for understanding eruption patterns and forecasting future activity. Given its recent activity, Lokon-Empung is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

The Lokong-Empung volcanic complex, rising above the plain of Tondano in North Sulawesi, includes four peaks and an active crater. Lokon, the highest peak, has a flat craterless top. The morphologically younger Empung cone 2 km NE has a 400-m-wide, 150-m-deep crater that erupted last in the 18th century. A ridge extending 3 km WNW from Lokon includes the Tatawiran and Tetempangan peaks. All eruptions since 1829 have originated from Tompaluan, a 150 x 250 m crater in the saddle between Lokon and Empung. These eruptions have primarily produced small-to-moderate ash plumes that sometimes damaged croplands and houses, but lava-dome growth and pyroclastic flows have also occurred.

— Smithsonian Institution, Global Volcanism Program