Galapagos Rift at 86°W

Geography & Climate

Galapagos Rift at 86°W is located in Ecuador, within the Galapagos Rift Volcanic Province of the broader Eastern Pacific Volcanic Regions. Situated at 0.79° N, 86.15° W in the Northern Hemisphere, the volcano lies within a tropical climate zone. With an elevation of -2,430 meters — below sea level — Galapagos Rift at 86°W is a submarine or submerged volcanic feature. Submarine volcanoes make up the majority of Earth's volcanic activity, though most eruptions go unobserved beneath the ocean surface. The volcanic landform is characterized as a cluster, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Galapagos Rift at 86°W is situated along a rift zone, where tectonic plates are pulling apart. As the crust thins and fractures, magma rises to fill the gap, creating volcanic activity. Rift volcanism typically produces more fluid lava flows rather than explosive blasts, which means communities near Galapagos Rift at 86°W in Ecuador generally face slower-moving hazards like lava flows and ground fissures rather than sudden pyroclastic events. However, rift volcanoes can still generate significant ash emissions and gas releases that affect local air quality. The dominant rock type is basalt / picro-basalt, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.

Eruption History Summary

Galapagos Rift at 86°W has 2 recorded eruptions in the geological database, spanning from 1972 CE to 1996 CE. These eruptions span roughly 24 years of volcanic history. The most recent eruption in 1996 CE places this volcano within the modern era of volcanological observation.

GVP Reference Summary

The Galápagos Rift is an oceanic spreading ridge between the Cocos plate to the north and the Nazca plate to the south. A large area of hydrothermal vents along the crest of the ridge ENE of the Galápagos Islands was discovered in 1977. The location listed here is the position of Clambake vent, which was surrounded by very youthful sediment-free flows of basaltic sheet lava. This position is at the northern limit of the location error circle for a 1972 earthquake swarm and only a few kilometers south of a concurrent fish kill (Macdonald and Mudie, 1974) that may have been associated with extrusion of lava flows. Very fresh, glassy, sediment-free sheet-flow lavas observed during dives near this site in February and March 1977 (Corliss et al., 1979); the morphology of the flows suggested that they were less than 5 years old (Chadwick and Embley, 1994). The rift at this point consists of a small rift valley 3-4 km wide with walls 200-250 m high. A low axial ridge formed by the youngest sediment-free lava flows rises about 20 m above the valley floor, flanked by older marginal ridges. A 2002 expedition discovered evidence for new lava flows covering markers emplaced in 1990.

— Smithsonian Institution, Global Volcanism Program