Graciosa Volcano | John Seach



39.02 N, 27.97 W
summit elevation 402 m

Graciosa volcano is located in central Azores. Eruptions from the caldera have produced tephra falls, pyroclastic flows, lahars, and lava flows.

Graciosa Island sits om the Terceira Rift, which extends from the Mid Atlantic Ridge to the East Azores Fracture Zone.

The average rainfall on Graciosa island is 966 mm per year, which is the lowest of the islands, which range up to 2,647 mm at Flores. Average annual runoff at the Azores is 680 mm, with a range between 134 (Graciosa) and 1,371 mm (the island of

Further reading
Larrea, Patricia, et al. "40 Ar/39 Ar constraints on the temporal evolution of Graciosa Island, Azores (Portugal)." Bulletin of Volcanology 76.2 (2014): 1-15.

Sibrant, A.L.R., Marques, F.O. and Hildenbrand, A., 2014. Construction and destruction of a volcanic island developed inside an oceanic rift: Graciosa Island, Terceira Rift, Azores. Journal of Volcanology and Geothermal Research284, pp.32-45.

Graciosa Volcano Eruptions

No recent eruptions.