Cotopaxi

Cotopaxi is a highly active stratovolcano located in the Andes Mountains of Ecuador.

It sits within Cotopaxi National Park, south of Quito and northeast of Latacunga. As a stratovolcano, it has a nearly symmetrical cone shape. It rises from a highland plain that is approximately 4,000 meters wide. The base of the mountain is about 15 kilometers across. Cotopaxi is the second highest summit in Ecuador, reaching 5,897 meters. It is part of the Pacific Ring of Fire, a chain of volcanoes surrounding the Pacific Plate.

The volcano's structure is defined by a wide crater at its summit. This crater features two concentric rims. The outer rim is irregular and often lacks snow. Inside the crater, the terrain is relatively flat and covered by ice cornices.

One of the most unique features is its equatorial glacier. This ice begins at a height of 5,000 meters. This glacier is a key part of how the volcano interacts with its environment. When volcanic heat increases, it can melt this ice rapidly.

This melting process creates a major geological hazard known as lahars. Lahars are massive mudflows caused by the sudden melting of ice and snow. During the 1877 eruption, pyroclastic flows melted the entire ice cap. This caused lahars to travel more than 50 kilometers. These flows reached the Pacific Ocean and the western Amazon basin. Such events can travel through river valleys and cause great damage. The city of Latacunga has been completely leveled by these mudslide deposits twice in history.

The history of Cotopaxi is deeply tied to the local people. In the Quechua language, the name may mean "neck moon." This refers to the crater's resemblance to a crescent moon. Long before the 15th-century Inca invasion, Andean people considered the mountain sacred. They worshiped it as a rain sender to ensure land fertility. They also believed the summit was a home for gods.

Records show that Cotopaxi has erupted 87 times. The first recorded eruption occurred in 1534. Scientists have found ash layers from this era in El Cajas National Park. Some of the most violent historical eruptions happened in 1742, 1744, 1768, and 1877.

In 1742, the eruption was witnessed by members of the French Geodesic Mission. More recent activity includes phreatic eruptions in 2015. These are steam-driven eruptions caused by the heating of groundwater. In 2022, a new eruptive phase began, producing thousands of earthquakes.

Climbing the volcano has a long history of exploration. In 1802, Alexander von Humboldt attempted a climb but only reached 5,300 meters. It was not until 1872 that Wilhelm Reiss and Angel Escobar reached the summit. Today, the mountain is a major destination for adventure tourism. Up to 100 climbers may attempt the summit on a single weekend. They often stay at the José F. Ribas Refuge, located at 4,864 meters. The climb is considered difficult and requires specialized gear like crampons and ice axes.

Safety remains a primary concern for the surrounding regions. The government estimates that 300,000 people are at risk from the volcano. This includes residents in the provinces of Cotopaxi, Tungurahua, Napo, and Pichincha. A very large explosion could threaten the suburban area of Quito, which has over 2,000,000 people. Because the volcano sits near major river valleys, the threat of lahars is constant. Monitoring by the Geophysical Institute of Ecuador helps track seismic activity and gas emissions to manage these risks.