Mount Unzen was designated a Decade Volcano by the United Nations, in 1991 as part of their International Decade for Natural Disaster Reduction, due to its history of violent activity and location in a densely populated area.
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Katia Krafft (née Catherine Joséphine Conrad, Mulhouse, 17 April 1942 – 3 June 1991) and her husband, Maurice Krafft (Guebwiller, 25 March 1946 – 3 June 1991) were French volcanologists who died in a pyroclastic flow on Mount Unzen, in Japan, on June 3, 1991.