4) Mount Fogo, Cape Verde
After a few days of increasing seismic activity the eruption of Pico de Fogo started on the 23rd of November, 2014. Local villagers spend the first night outside because of the strong earthquakes. Evacuations started once the eruption got underway. The eruption only stopped after a total of 77 days. By that time two villages were destroyed and over 1500 people had been evacuated. Fortunately there was no loss of life.
The entire island of Fogo is part of the volcano that has a diameter of 25km. A major eruption would give the 37,200 people living on the island little chance to escape.
3) Karthala, Comoros
Mount Karthala (or Karthola) is an active volcano with a height of 2361m above sea level. It is one of two volcanoes that form the Grande Comore Island. With more than 20 eruptions since the 19th century it is considered highly active and dangerous.
After a long quiet period the volcano blasted into action in April 2005. The large lava flows and deadly volcanic gases that were spewed out by the volcano caused the evacuation of 30,000 people. In 2006, 2007 and 2012 the volcano erupted again, but these were much smaller than in 2005.
With over 300,000 people living on the small island a large eruption would cause massive damage and loss of life.