Activity of the Atlantic volcanoes, 1947–1965

A remarkable sequence of volcanic eruptions were observed in the Atlantic, during the last 20 years: Hckla in 1947, La Palma in 1949, Fogo in 1951, Fayal in 1957, Tristan da Cunha in 1961, Askja in 1961, Surtsey in 1963 (and possibly San Jorge in 1964). The long-period components of the Earth tide seem to influence the eruptive epochs, acting as trigger-forces.