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History of Arenal Volcano, Costa Rica
The earliest known eruptions of Arenal took place about 7,000 years ago, and it was active concurrently with Cerro Chato until the activity of this last ended about 3,500 years ago.
(En Español: Historia del Volcán Arenal)
Arenal Volcano History
Most Recent 2012 Eruptions & Activity Report!
Arenal Volcano is part of a volcanic chain formed between 100 and
12 thousands of years ago which contains, in chronological
order according to its formation, the lava domes "Los Perdidos" (whose erosion had gave place to the beautiful Fortuna Waterfall),
the currently inactive and about 12 thousands of years old "Chato" volcano (whose crater becomes filled with water and host now a 500 m wide fantastic lake) and finally the spectacular active
Arenal Volcano. About 7,000 years ago have taken place the first known eruptions of Arenal, and it was active concurrently with Chato Volcano until this last ended its activity about 3,500 years ago. Throughout the time the volcanic activity of Arenal features periodic major
explosive eruptions (at intervals of several hundreds of years) and
periods of lava effusion that have built the volcanic cone.
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