Sabancaya fumaroles

Magma beneath Sabancaya releases hot water vapor, sulfur dioxide, and other volcanic gases through vents and fractures. Explosive activity can mix these gases with ash, producing columns visible far beyond Peru's Colca Valley.

No, a fumarolic plume can consist mostly of steam and volcanic gases without fresh ash. Sabancaya also produces explosive ash emissions, so Peru's monitoring agencies distinguish gas-rich degassing from ash-bearing eruptions.

Peruvian observatories use seismic instruments, satellite observations, cameras, deformation measurements, and sulfur dioxide data. Reports from institutions such as IGP and INGEMMET help authorities assess ashfall and aviation hazards.

Settlements in and around the Colca Valley can receive ash depending on wind direction, with effects on breathing, water, crops, and livestock. Sabancaya lies in Peru's Arequipa region near the older Ampato and Hualca Hualca volcanic centers.