El Misti: A Deep Dive into the Volcano Above Arequipa
El Misti is the iconic volcano of southern Peru, a strikingly symmetrical cone that rises directly above Arequipa, the country's second-largest city. Its graceful form is woven into the identity of the city below, appearing on its skyline and in its art. But El Misti is also one of the most potentially dangerous volcanoes in Peru, because so many people live within reach of its eruptions, making it a focus of serious hazard planning.
A cone above a city
El Misti reaches about 5,822 metres and stands just a short distance from the heart of Arequipa, a city of roughly a million people. Its near-perfect conical shape, often capped with snow, dominates the urban skyline and has made it a beloved symbol of the region. Few major cities sit so close to such a large and active volcano.
A typical Andean stratovolcano
El Misti is a classic Andean stratovolcano, built by the subduction of the Nazca Plate beneath South America. Its steep cone is composed of alternating layers of lava and explosive deposits, and it has multiple nested craters at its summit. It forms part of a volcanic group with the neighbouring peaks of Chachani and Pichu Pichu, which together frame the city of Arequipa.
A history of eruptions
El Misti has erupted numerous times over the past several thousand years, including significant explosive events. One notable eruption around the fifteenth century is thought to have affected the region and is recorded in local history and deposits. While the volcano has been relatively quiet in recent centuries, showing mainly fumarolic activity, its geological record makes clear its capacity for substantial eruptions.
The threat to Arequipa
The proximity of El Misti to Arequipa makes it one of the highest-risk volcanoes in Peru. A major eruption could shower the city with ash, generate pyroclastic flows, and produce lahars that travel down the valleys into populated areas. The combination of a large, capable volcano and a major city at its foot is precisely the kind of situation that volcanic hazard planning seeks to address.
Lahars and the valleys
Among the most serious hazards from El Misti are lahars. Volcanic debris on its slopes, mobilised by heavy rain or by melting of summit ice during an eruption, can flow down the river valleys that pass through Arequipa. Mapping these valleys and planning for lahar evacuation is a central part of managing the risk the volcano poses to the city.
Monitoring and preparedness
Peruvian volcanologists monitor El Misti closely, tracking its seismicity, gas emissions, and ground deformation. Given the enormous population at risk, authorities have invested in hazard maps, monitoring networks, and public education, working to ensure that the city is prepared should the volcano show signs of reawakening. This preparedness is essential for a volcano of such potential consequence.
A cultural and natural landmark
Beyond its hazards, El Misti is a cherished part of Arequipa's identity and a draw for climbers and visitors. Its slopes can be ascended on a strenuous high-altitude trek, and archaeological finds near its summit attest to its significance to pre-Columbian peoples. The volcano is thus woven into the cultural, natural, and everyday life of southern Peru.
Explore on the map
El Misti stands among Peru's chain of Andean volcanoes, alongside Ubinas, Sabancaya, and others. Explore it on the interactive map — filter by country to see El Misti among Peru's volcanoes and to appreciate the close relationship between Arequipa and its towering, beautiful, and dangerous neighbour.