Zitacuaro-Valle de Bravo

Geography & Climate

Zitacuaro-Valle de Bravo is located in Mexico, within the Trans-Mexican Volcanic Arc of the broader Middle America-Caribbean Volcanic Regions. Situated at 19.40° N, 100.25° W in the Northern Hemisphere, the volcano lies within a tropical climate zone. At 3,500 meters above sea level, Zitacuaro-Valle de Bravo rises above the surrounding terrain into montane or subalpine conditions. The elevation creates distinct ecological zones along its flanks, from forested lower slopes to exposed rocky terrain near the summit. 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

Zitacuaro-Valle de Bravo 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 Mexico near Zitacuaro-Valle de Bravo, 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 dacite, an intermediate to silica-rich volcanic rock. This composition typically produces more viscous magma, leading to more explosive eruptions with ash columns and pyroclastic flows. Andesitic and dacitic magmas build pressure before erupting, which is why volcanoes with this rock chemistry are often associated with Plinian-style eruptions that can send ash tens of kilometers into the atmosphere and disrupt aviation across entire regions.

Eruption History Summary

Zitacuaro-Valle de Bravo has 1 recorded eruption in the geological database, spanning from 3050 BCE to 3050 BCE.

GVP Reference Summary

The Zitácuaro-Valle de Bravo volcanic field in the central part of the Trans-Mexican Volcanic Belt consists of a broad region of shield volcanoes, lava domes, and cinder cones surrounding the city of Heroica de Zitácuaro. The Zitácuaro volcanic complex itself, located SE of the city, was constructed within the 30-km-wide Las Tres Chicas caldera of Miocene age, which later underwent three post-caldera episodes of intra-caldera lava dome resurgence and included the intrusion of dacitic central lava domes, the emplacement of pyroclastic flows, and the eruption of andesitic lava flows. The youngest dated activity at the complex produced La Dieta airfall deposit about 31,000 years ago, and persistent local seismicity continues at Zitácuaro. The Valle de Bravo area to the south contains dominantly andesitic lava domes and flows, many of which were erupted along regional faults. The youngest flows were erupted at the bottom of a fault-controlled canyon; the most recent of these, west of the Valle de Bravo lake, has been Ar-Ar dated at about 5,200 +/- 2,300 years, and morphology suggests a Holocene age for other cones.

— Smithsonian Institution, Global Volcanism Program