Global Volcanism Program | Image GVP-07067
Hummocky terrain on the south flank of Irazú marks the path of the Cervantes lava flow. This massive compound flow originated from two vents, Cerro Pasquí and another to the NW, producing the eastern and western Cervantes flows, respectively. The former traveled about 10 km to the base of the volcano. These flows are chemically bimodal, with the 0.17 cu km western flow being basaltic in composition and the 0.9 cu km eastern flow basaltic andesite. Radiocarbon ages for the flow range between about 14,000 and 17,000 years ago.
Photo by Guillermo Alvarado, 1986 (Instituto Costarricense de Electricidad).