Soufriere St. Vincent

Geography & Climate

Soufriere St. Vincent is located in Saint Vincent and the Grenadines, within the Lesser Antilles Volcanic Arc of the broader Middle America-Caribbean Volcanic Regions. Situated at 13.33° N, 61.18° W in the Northern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 1,220 meters above sea level, Soufriere St. Vincent is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a composite, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Soufriere St. Vincent sits in a subduction zone, where one tectonic plate dives beneath another, creating intense heat and pressure that generates magma. Subduction zones are responsible for many of the world's most explosive volcanoes and deadliest eruptions. For communities in Saint Vincent and the Grenadines near Soufriere St. Vincent, this tectonic setting means the volcano is capable of producing powerful explosive eruptions, pyroclastic flows, and lahars that can threaten populated areas within tens of kilometers of the summit. The dominant rock type is andesite / basaltic andesite, 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

Soufriere St. Vincent has 20 recorded eruptions in the geological database, spanning from 2135 BCE to 2020 CE. The most powerful recorded event was a cataclysmic eruption with ash columns reaching the stratosphere in 2020 CE, reaching VEI 4 on the Volcanic Explosivity Index. Notable eruptions include 2020 CE (VEI 4), 1979 CE (VEI 3), 1902 CE (VEI 4). With an average interval of roughly 208 years between eruptions over a span of 4,155 years, this is one of the more frequently active volcanoes in the database. This persistent activity suggests a robust and well-supplied magma system beneath the volcano. With eruptive activity as recently as 2020 CE, Soufriere St. Vincent remains an actively monitored volcano.

Significance

With a maximum recorded VEI of 4, Soufriere St. Vincent has demonstrated the capacity for significant explosive eruptions that can impact regional aviation, agriculture, and communities tens of kilometers from the summit. VEI 4 eruptions produce ash columns reaching 15-25 kilometers into the atmosphere. Its 20 recorded eruptions make it one of the most prolific volcanoes in our database, reflecting a persistent and well-documented eruptive history that has provided volcanologists with extensive data for understanding eruption patterns and forecasting future activity. Given its recent activity, Soufriere St. Vincent is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

Soufrière St. Vincent is the northernmost and youngest volcano on St. Vincent Island. The NE rim of the 1.6-km wide summit crater is cut by a crater formed in 1812. The crater itself lies on the SW margin of a larger 2.2-km-wide caldera, which is breached widely to the SW as a result of slope failure. Frequent explosive eruptions after about 4,300 years ago produced pyroclastic deposits of the Yellow Tephra Formation, which cover much of the island. The first historical eruption took place in 1718; it and the 1812 eruption produced major explosions. Much of the northern end of the island was devastated by a major eruption in 1902 that coincided with the catastrophic Mont Pelée eruption on Martinique. A lava dome was emplaced in the summit crater in 1971 during a strictly effusive eruption, forming an island within a lake that filled the crater. A series of explosive eruptions in 1979 destroyed the 1971 dome and ejected the lake; a new dome was then built.

— Smithsonian Institution, Global Volcanism Program