LONG DORMANT VOLCANOES CAN ERUPT RAPIDLY AND EXPLOSIVELY

Can a volcano erupt after tens of thousands of years of dormancy? If so, how can this be explained and what makes volcanic eruptions more dangerous, i.e. explosive? These are key questions in volcanic hazard assessment and can also draw attention to volcanoes that appear to be inactive. Even in a quiet dormant phase, a volcano can rapidly become active and its eruption can pose a previously unknown threat to the surrounding area. New research by Hungarian scientists is helping to reveal the signs before such a volcano erupts. 

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Source: https://geo.elte.hu/en