Negro, Cerro

Geography & Climate

Negro, Cerro is located in Nicaragua, within the Central America Volcanic Arc of the broader Middle America-Caribbean Volcanic Regions. Situated at 12.51° N, 86.70° W in the Northern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 728 meters above sea level, Negro, Cerro is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a minor, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Negro, 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 Nicaragua near Negro, 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 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

Negro, Cerro has 20 recorded eruptions in the geological database, spanning from 1919 CE to 1999 CE. The most powerful recorded event was a severe eruption capable of regional ash fall and pyroclastic flows in 1992 CE, reaching VEI 3 on the Volcanic Explosivity Index. Notable eruptions include 1992 CE (VEI 3), 1971 CE (VEI 3), 1968 CE (VEI 3). With an average interval of roughly 4 years between eruptions over a span of 80 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. The most recent eruption in 1999 CE places this volcano within the modern era of volcanological observation.

Significance

With a maximum recorded VEI of 3, Negro, Cerro has produced eruptions capable of generating pyroclastic flows and significant ash fall in the surrounding area. While not among the largest eruptions globally, VEI 3 events pose serious hazards to local populations and can disrupt regional air travel. 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, Negro, Cerro is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

Nicaragua's youngest volcano, Cerro Negro, was created following an eruption that began in April 1850 about 2 km NW of the summit of Las Pilas volcano. It is the largest, southernmost, and most recent of a group of four youthful cinder cones constructed along a NNW-SSE-trending line in the central Marrabios Range. Strombolian-to-subplinian eruptions at intervals of a few years to several decades have constructed a roughly 250-m-high basaltic cone and an associated lava field constrained by topography to extend primarily NE and SW. Cone and crater morphology have varied significantly during its short eruptive history. Although it lies in a relatively unpopulated area, occasional heavy ashfalls have damaged crops and buildings.

— Smithsonian Institution, Global Volcanism Program