Sabancaya

Geography & Climate

Sabancaya is located in Peru, within the Central Andean Volcanic Arc of the broader South America Volcanic Regions. Situated at 15.79° S, 71.86° W in the Southern Hemisphere, the volcano lies within a tropical climate zone. At 5,960 meters above sea level, Sabancaya reaches well into the permanent snow and ice zone. Glaciers and snowpack on the upper slopes create the potential for lahars — destructive volcanic mudflows — during eruptions, as heat rapidly melts ice and snow. 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

Sabancaya 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 Peru near Sabancaya, 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

Sabancaya has 15 recorded eruptions in the geological database, spanning from 6600 BCE to 2025 CE. The most powerful recorded event was a severe eruption capable of regional ash fall and pyroclastic flows in 2016 CE, reaching VEI 3 on the Volcanic Explosivity Index. Notable eruptions include 2016 CE (VEI 3), 1990 CE (VEI 3). This level of eruptive frequency indicates a persistently active volcanic system that warrants ongoing monitoring. With eruptive activity as recently as 2025 CE, Sabancaya remains an actively monitored volcano.

Significance

With a maximum recorded VEI of 3, Sabancaya 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. With 15 recorded eruptions, Sabancaya has a substantial eruptive history that provides valuable data for understanding volcanic behavior and assessing future hazards in the South America Volcanic Regions region. Given its recent activity, Sabancaya is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

Sabancaya, located in the saddle NE of Ampato and SE of Hualca Hualca volcanoes, is the youngest of these volcanic centers and the only one to have erupted in historical time. The oldest of the three, Nevado Hualca Hualca, is of probable late-Pliocene to early Pleistocene age. The name Sabancaya (meaning "tongue of fire" in the Quechua language) first appeared in records in 1595 CE, suggesting activity prior to that date. Holocene activity has consisted of Plinian eruptions followed by emission of voluminous andesitic and dacitic lava flows, which form an extensive apron around the volcano on all sides but the south. Records of observed eruptions date back to 1750 CE.

— Smithsonian Institution, Global Volcanism Program