Terceira Volcano | John Seach



38.73 N, 27.32 W
summit elevation 1023 m

Terceira Volcano is located in central Azores. It contains four stratovolcanoes aligned along a ESE-WNW-trending fissure zone which cuts across the island. Santa Barbara volcano at the western end of the island contains two calderas. Pico Alto lies north of the fissure zone. Guilherme Moniz caldera lies along the fissure zone. Cinquio Picos caldera at the SE end of the island is the largest in the Azores.

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

Historical eruptions have occurred from Pico Alto, the fissure zone between Pico Alto and Santa Barbara, and from submarine vents west of Santa Barbara.

Submarine eruptions occurred at the Serreta Volcanic Ridge 9-14 km off Terceira Island in 1998 - May 2000 and August 2001.

Further reading
Casalbore, D. et al., 2015. Volcanic, tectonic and mass-wasting processes offshore Terceira Island (Azores) revealed by high-resolution seafloor mapping. Bulletin of Volcanology77(3), pp.1-19.

Calvert, A.T., Moore, R.B., McGeehin, J.P. and da Silva, A.M.R., 2006. Volcanic history and 40Ar/39Ar and 14C geochronology of Terceira Island, Azores, Portugal. Journal of Volcanology and Geothermal Research156(1-2), pp.103-115.

Terceira Volcano Eruptions

2001, 1998-2000, 1867, 1761