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Underwater volcanic eruptions cause large green stains on sea's surface

Spanish gov. via AFP - Getty

An aerial view of a green stain on the sea's surface off the coast of the El Hierro, one of the Spanish Canary Islands, a day after two underwater volcanic eruptions were recorded.

Desiree Martin / AFP - Getty Images

A green stain on the surface of the sea off the coast of the Spanish Canary Islands.

Two underwater volcanic eruptions off the coast of Spain's Canary Islands have caused two large green stains to appear on the surface of the sea. In addition to the stains, there is a strong smell of sulfur and dead fish.  On Tuesday, the eruptions lead to the evacuation of about 600 people from their homes.

For more information: Volcanic threat to Spanish island eases

Desiree Martin / AFP - Getty Images

Experts from the Volcanological Institute of the Canary Islands use a thermal infrared camera to analyze a stain in the sea off the coast of El Hierro, one of the Spanish Canary Islands, early on Oct. 13.