7) Manda Hararo, Ethiopia
The Manda Hararo is a group of volcanoes that first erupted in 2007. There were no warning signs according to the local population. The violent eruption continued for three days while the local people fled the area. In 2009 the volcano erupted again and lava flows were seen up to 5km away from the Volcano. No casualties were reported.
The volcanic field around the two main volcanoes is considered the most active volcanic field in the world.
6) Mount Cameroon
Mount Cameroon is the most active volcano in West Africa. Locally it is also known as Mongo ma Ndemi or Fako. It is one of the largest volcanoes in Africa with a height of 4040m. In 2000 lava flows caused by two eruptions came very close to the town of Buea. In 2012 there was a small eruption, but this time it mostly produced ash that posed no danger in the area. It did however injure two guides that were on the mountain at the time.
With around 500,000 people living or working on the flanks of the volcano a larger eruption would cause catastrophic damage.
5) Nyamuragira, Democratic Republic of Congo
This is the most active volcano in Africa. It erupted roughly every two years for decades. However, it has been fairly quiet since 2011 when the last major eruption occurred. In 2014 the volcano became active again creating a lava lake in the caldera (crater) with a depth of 500m.
There are no villages close to the volcano fortunately. However, its lava flows could still be dangerous as the volcano lies only 25km north of Lake Kivu. A large lava flow into the lake could lead to lake overturning. Lake overturning is when a sudden change in the lake brings CO2 and other dangerous gasses to the surface. In 1986 this caused the death of around 1700 people at nearby Lake Nyos.
Lake Kivu is almost 2000 times larger and around 2 million people live around the lake. An event like the one at Lake Nyos could have a devastating effect. The chance of this happening is luckily quite low as the CO2 concentrations in the lake are not as high as in Lake Nyos.