About Blanco, Cerro
Blanco, Cerro is a caldera rising to 4,670 meters (15,322 feet) in Argentina's South America Volcanic Regions. The volcano is currently active, with its most recent eruption in 2300 BCE. The volcano has produced 1 recorded eruption, with a maximum Volcanic Explosivity Index (VEI) of 7.
Geography & Climate
Blanco, Cerro is located in Argentina, within the Central Andean Volcanic Arc of the broader South America Volcanic Regions. Situated at 26.77° S, 67.75° W in the Southern Hemisphere, the volcano lies within a subtropical climate zone. Standing at 4,670 meters above sea level, Blanco, Cerro towers above the alpine zone, where vegetation gives way to bare rock, snow, and ice for much of the year. The high elevation means the upper slopes experience significantly colder temperatures than surrounding lowlands. The volcanic landform is characterized as a caldera, which describes the physical shape and structure of the volcanic edifice as observed from the surface.
Geological Context
Blanco, Cerro 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 Argentina near Blanco, Cerro, 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 rhyolite, a silica-rich volcanic rock associated with highly viscous magma. Rhyolitic eruptions can be extremely explosive and are responsible for some of the largest volcanic events in Earth's history, including supervolcanic caldera-forming eruptions. The high silica content traps dissolved gases, building enormous pressure that can lead to catastrophic explosive releases.
Eruption History Summary
Blanco, Cerro has 1 recorded eruption in the geological database, spanning from 2300 BCE to 2300 BCE. The most powerful recorded event was a super-colossal eruption, among the largest in recorded geological history in 2300 BCE, reaching VEI 7 on the Volcanic Explosivity Index.
Significance
Blanco, Cerro has produced at least one eruption of VEI 7 or higher, placing it among the most powerful volcanic systems ever documented on Earth. Eruptions of this magnitude eject hundreds of cubic kilometers of material, can cause volcanic winters lasting years, and have historically led to crop failures and famine across continents.
GVP Reference Summary
The Cerro Blanco volcanic complex contains the 5-km-diameter Cerro Blanco (or Robledo) caldera in NW Argentina, 80 km SW of the Cerro Galán caldera. Cerro Blanco was the site of the largest known Holocene eruption in the Central Andes about 4,200 years BP (Fernandez-Turiel et al., 2013). The rhyolitic Plinian eruption produced ashfall over about 110 km3 and widespread ignimbrite deposits. The large Cerro Blanco del Robledo lava dome overgrew the SW rim of the caldera and is surrounded by extensive rhyolitic pumice-fall deposits. Satellite geodetic surveys in the central Andes (Pritchard and Simons, 2002) showed subsidence of the caldera in the 1990s.
— Smithsonian Institution, Global Volcanism Program
1 Recorded Eruption
| Year | VEI | Type | Area |
|---|---|---|---|
| 2300 BCE | 7 | Confirmed Eruption | — |
Real-Time Data
USGS Alert Level
Thermal Anomalies
Frequently Asked Questions About Blanco, Cerro
Is Blanco, Cerro an active volcano?+
Blanco, Cerro is not currently classified as active. Its activity evidence is listed as "Eruption Dated." The last known eruption was in 2300 BCE. However, no volcano is ever considered permanently extinct.
When did Blanco, Cerro last erupt?+
The most recent recorded eruption of Blanco, Cerro occurred in 2300 BCE with a Volcanic Explosivity Index (VEI) of 7. The eruption was classified as a "Confirmed Eruption." Blanco, Cerro has 1 recorded eruption in total.
How high is Blanco, Cerro?+
Blanco, Cerro has a summit elevation of 4,670 meters (15,322 feet) above sea level. At 4,670 meters, it stands taller than Mount Rainier (4,392m) and is among the world's major volcanic peaks.
What type of volcano is Blanco, Cerro?+
Blanco, Cerro is classified as a Caldera. Calderas are large volcanic depressions formed when a volcano erupts so powerfully that its magma chamber collapses, creating a basin that can be kilometers wide. They are often sites of some of Earth's largest eruptions.
Where is Blanco, Cerro located?+
Blanco, Cerro is located in Argentina, in the South America Volcanic Regions. More specifically, it lies within the Central Andean Volcanic Arc. Its exact coordinates are -26.766° latitude, -67.746° longitude.
Is it safe to visit Blanco, Cerro?+
Blanco, Cerro can generally be visited, but as with any volcano, visitors should check local conditions and any advisory notices before traveling. Argentina may have specific regulations for accessing volcanic areas. Guided tours are often the safest and most informative way to experience a volcano.
