A volcano may be termed as a Decade Volcano if it exhibits more than one volcanic hazard i.e. tephra fall, pyroclastic flows or lahars, silicic lava flows, edifice instability and lava dome collapse. If it also shows recent geological activity and is located in a populated area is a threat to hundereds of people. A total of 16 volcanos have been designated as deadly volcanos, as per International Association of Volcanology and Chemistry of the Earth’s Interior. In fact the name happened because of a UN sponsored project- International Decade for Natural Disaster Destruction (1990- 2000). In short, decade volcanos are considered to be the most dangerous, notorious and hazardous volcanos.
The project mainly involved conducting workshops, identifying strengths and weaknesses of lowering risks during each eruption and addressing the notified weaknesses.