Galeras

Galeras is an active stratovolcano in southwestern Colombia, located in the Nariño Department near the city of Pasto. It is one of the country’s most active volcanoes and rises to about 4,276 meters above sea level. The volcano forms part of the Andean volcanic belt, a result of the ongoing subduction of the Nazca Plate beneath the South American Plate.

Geology and activity: Galeras is a product of subduction-related volcanism and has a summit crater and associated volcanic structures that have produced periodic explosive eruptions. Its activity includes ash plumes, pumice fall, lava domes, pyroclastic flows, and lahars, posing hazards to nearby populations and infrastructure.

History and notable events: The volcano has a long record of eruptions. A well-known eruption occurred in 1993 during a field visit by scientists and authorities, which killed several people and led to changes in monitoring and safety practices.

Monitoring and hazards: The volcano is monitored by the Servicio Geológico Colombiano and other agencies, using seismic networks, gas measurements, and ground deformation data. Hazard assessments and evacuation plans exist for Pasto and surrounding areas, with ash advisories potentially disrupting air travel in the region.

Current status: Galeras remains active, with ongoing fumarolic activity and periodic eruptions. It is closely watched by scientists and local authorities to provide early warnings and reduce risk to nearby residents and infrastructure.