Sierra Negra Volcano
Galápagos
Sierra Negra is a large shield volcano located at the southeastern end of Isabela Island in the Galápagos archipelago, rising to 1,124 meters. It forms part of a volcanic complex along with Cerro Azul and Alcedo volcanoes. Known for its broad, gently sloping profile, Sierra Negra features the largest caldera in the Galápagos, measuring approximately 7.2 by 9.3 kilometers with a shallow depth of about 100 meters. The caldera includes a complex ridge and a significant fumarolic area called Volcán de Azufre, notable for terrestrial sulfur flows associated with melting sulfur deposits. The volcano is among the most active in the archipelago, with eruptions recorded in 1911, 1948, 1953, 1954, 1957, 1963, 1979, 2005, and most recently in 2018. Scientific monitoring and supercomputer models have been used to predict eruptions, although some events occurred with little short-term warning. The eastern and southern slopes are covered with tropical forests and fertile soils supporting agriculture and unique wildlife, including the endangered Sierra Negra giant tortoise species, Chelonoidis nigra guentheri. The northern slopes are largely barren due to recent lava flows. The volcano’s geological formation is linked to a mantle plume hotspot beneath Fernandina volcano, contributing to the creation of Isabela’s volcanic chain. Visitors often start tours from Puerto Villamil, traversing the caldera rim and exploring fresh lava fields, offering a remarkable natural and geological experience.
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Consejo: Visitors should plan tours starting from Puerto Villamil, following guided routes along the caldera rim and lava fields. The best time to visit is during dry months for safer hiking conditions. Advance booking of guided tours is recommended due to the volcano’s active status and conservation regulations. Discounts may be available for students and groups. Visitors should prepare for variable weather and bring adequate water and sun protection.
Datos interesantes
- •Sierra Negra has the largest caldera in the Galápagos Islands, measuring about 7.2 by 9.3 km.
- •It is one of the most active volcanoes in the Galápagos, with eruptions recorded as recently as 2018.
- •The Volcán de Azufre fumarolic area produces rare terrestrial sulfur flows, linked to melting sulfur deposits.
- •Scientific supercomputer models predicted the 2018 eruption five months in advance, a rare success in volcanic forecasting.
- •The volcano’s gentle slopes average only 2 to 5 degrees, unlike steeper neighboring volcanoes on Isabela Island.
Historia
Sierra Negra formed approximately 535,000 years ago from volcanic activity associated with a mantle plume hotspot beneath Fernandina volcano.
Over centuries, it developed its distinctive broad shield shape and the largest caldera in the Galápagos.
Documented eruptions date back to 1911, with frequent activity throughout the 20th century and into the 21st, including major eruptions in 2005 and 2018.
The volcano’s eruptive history has shaped the local landscape and ecology, influencing lava flow patterns and vegetation zones.
Scientific advances have allowed eruption predictions using supercomputer models, reflecting the volcano’s significance for geological monitoring.
Guía del lugar
Caldera Rim Trail
This trail follows the rim of Sierra Negra’s massive caldera, offering panoramic views of the volcanic landscape and neighboring volcanoes. Hikers can observe geological features such as lava flows, fumaroles, and the complex caldera ridge.
Volcán de Azufre
A fumarolic area within the caldera known for its unique terrestrial sulfur flows. This site is important for scientific study of volcanic gases and sulfur melting processes.
Fresh Lava Fields
These fields northeast of the main crater showcase recent lava flows from past eruptions, with stark, barren terrain contrasting with vegetated slopes elsewhere on the volcano.