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Sir Steve Sparks (white shirt) looks into a camera while he observes the 1979 eruption. Other scientists watch the eruption and make observations.

Scientists wearing hard hats and in the possession of gas masks install a seismometer in a metal box on La Soufrière, St Vincent - April 1979.

View down into the crater of La Soufrière St Vincent in 1979 a lava dome has grown our of the crater floor. White steam can be seen.

A scientist wearing a hard hat examines pyroclastic flow deposits in a river valley on St Vincent - April 1979

An exposed section of pyroclastic flow deposits from the 1979 eruption of La Soufrière St Vincent. A hammer is used for scale.

View of La Soufrière from the sea, the sky is cloudy and a rainbow is cast over the volcano.

View from land down into the ocean off the coast of St Vincent, ash can be seen washing out into the water turning it a brown colour.

Scientists in hard hats and goggles make observations from a boat off the coast of St Vincent in 1979

View of La Soufrière St Vincent, from the Belmont observatory - April 1979

View of a dilute slow moving surge related to collapse of plume margins on the volcano and entering the water on the leeward side of St Vincent - April 1979 from the Belmont volcano observatory