Ubinas: A Deep Dive into Peru's Most Active Volcano
Ubinas, in the southern Peruvian Andes, holds the distinction of being the most active volcano in the country. Its frequent eruptions of ash and gas have repeatedly disrupted the lives of the communities farming the fertile valleys below its steep slopes, forcing evacuations and damaging crops and livestock. Ubinas is a volcano whose persistent activity makes it a central concern for Peruvian volcanology and a recurring challenge for the people who live around it.
Peru's most active volcano
Ubinas reaches about 5,672 metres and is recognised as the most active volcano in Peru, with numerous eruptions recorded over the past several centuries. Its activity is dominated by explosive ash emissions and gas, punctuated by occasional larger eruptions. This frequent unrest sets it apart from Peru's other Andean volcanoes and keeps it under near-constant scientific watch.
A steep cone above fertile valleys
Ubinas is a steep stratovolcano with a deep summit crater, rising above valleys that are intensively farmed thanks to their fertile volcanic soils. The communities of the Ubinas valley grow crops and raise livestock in the shadow of the volcano, a proximity that makes its eruptions a direct and recurring threat to their lives and livelihoods.
Recurring eruptions and evacuations
Ubinas has erupted repeatedly in recent decades, with significant episodes in the 2000s and 2010s. These eruptions have produced ash plumes that coated the surrounding region, contaminated water and pasture, and harmed livestock. On more than one occasion, authorities have evacuated residents from the most affected areas, sometimes relocating entire communities, in response to the volcano's activity.
The hazard of ash and fluorine
Beyond the immediate dangers of explosions, Ubinas poses a more insidious threat through its ashfall. Volcanic ash can contaminate water supplies and pastures, and fluorine carried in the ash can poison grazing animals, a serious blow to the agricultural communities that depend on livestock. Managing these effects is a key part of living with the volcano.
Lahars in the valleys
Like other steep Andean volcanoes, Ubinas can generate lahars when ash and debris on its slopes are mobilised by rain or meltwater. These mudflows can travel down the valleys that channel toward populated and farmed areas, adding to the range of hazards that the communities below must contend with and that hazard planning must address.
Monitoring and managing the risk
Peruvian volcanologists monitor Ubinas intensively, given its status as the country's most active volcano. Seismic networks, gas measurements, and cameras track its behaviour, and alerts guide decisions on evacuation and the protection of nearby communities. The recurring nature of its eruptions has made Ubinas a focus for developing Peru's volcanic risk management.
Living with frequent activity
For the people of the Ubinas valley, life is shaped by the volcano's frequent unrest. Repeated ashfalls, evacuations, and the need to protect crops and animals are part of an ongoing relationship with one of South America's most restless volcanoes. Their experience illustrates the practical challenges of living sustainably in the shadow of a persistently active volcano.
Explore on the map
Ubinas stands among Peru's chain of Andean volcanoes, alongside El Misti, Sabancaya, and others. Explore it on the interactive map — filter by country to see Ubinas among Peru's volcanoes and to appreciate the challenges faced by communities living beside the country's most active volcano.