description Los Humeros Fumaroles Overview
The Los Humeros fumaroles are volcanic gas vents located within a massive caldera complex in Mexico. The caldera measures approximately 15 by 21 kilometers and was formed around 460,000 years ago due to a major volcanic eruption. Today, the intense geothermal activity associated with these fumaroles is harnessed for electrical power generation by a large geothermal plant.
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How large is the Los Humeros caldera?
The older Los Humeros caldera is commonly described as about 15 by 21 km across. It formed when the Xáltipan Ignimbrite erupted roughly 460,000 years ago. [Smithsonian Global Volcanism Program](https://volcano.si.edu/volcano.cfm?vn=341093)
What is a fumarole at Los Humeros?
A fumarole is a volcanic vent that releases hot steam and gases from the geothermal system. Los Humeros still has fumarolic activity, hot springs, and an operating geothermal field.
Where is the Los Humeros geothermal field?
Los Humeros is in Puebla, Mexico, within the Trans-Mexican Volcanic Belt. Mexico's Comisión Federal de Electricidad operates the Los Humeros geothermal field as one of the country's major geothermal areas.
Is Los Humeros one caldera or a larger volcanic complex?
It is a volcanic and geothermal complex with nested caldera structures. Studies distinguish the older outer Los Humeros caldera from the younger Los Potreros caldera, which formed roughly 70,000 years ago.
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