Monitoring of Volcanic Activity at Nyiragongo and Nyamuragira in Eastern Zaire and Their Volcanic Hazard Assessment Introduction The Nyiragongo volcano in eastern Zaire was chosen in 1991 as the African Decade Volcano by IAVCEI as an activity of International Decade of Natural Disaster Reduction (IDNDR) Program. This volcano presents the highest potential threat to human lives among the many ...