Flores Volcano | John Seach



39.40 N, 31.17 W
summit elevation 915 m

Note: There is another volcano called Flores in Guatemala.

Flores Island is the westernmost island in the Azores. It is located on the North American tectonic plate, and is separated from the rest of the archipelago by the mid Atlantic Ridge.

The island is aligned north–south (parallel to the Mid Atlantic Ridge) and nearly perpendicular to the alignment of the other Azorean islands.

Caldeira Funda de Lajes tuff ring formed about 3150 years ago. It produced a lava flow which extended NW and reached the coast at Faja Grande.

The evolution of Flores island over the past 1 million years can be divided into four stages.

Stage 1 (1.0 to 0.55 Ma)
Explosive eruptions formed the initial island. Tectono-volcanic uplift
took place, raising the island by 100 m.

Stage 2 (0.55 to 0.4 Ma)
Eruptions of large volumes of lava from three eruptive centres was followed by a long period of volcanic quiescence (0.5 to 0.4 Ma).

Stage 3 (0.4 to 0.2 Ma)
The last major eruptive episode of this island occurred during this period. There were no important vertical tectonic movements during this stage.

Stage 4 (0.2 Ma until the present)
Strombolian and phreatomagmatic eruptions occurred about 3000 years ago.

Further reading
Hildenbrand, A., Marques, F.O. and Catalão, J., 2018. Large-scale mass wasting on small volcanic islands revealed by the study of Flores Island (Azores). Scientific reports8(1), pp.1-11.

Azevedo, J.M.M. and Ferreira, M.P., 2006. The volcanotectonic evolution of Flores Island, Azores (Portugal). Journal of volcanology and geothermal research156(1-2), pp.90-102.

Azevedo, J.M.M., Ferreira, M.R. and Martins, J.Á., 1991. The emergent volcanism of Flores Islands, Azores (Portugal). Arquipélago-Life and Earth Sciences9, pp.37-46.

Flores Volcano Eruptions

950 BC ± 100, 1200 BC ± 100.