The 1991 eruption of Mount Unzen, in Nagasaki Prefecture, Japan, was part of a longer eruptive episode, known in Japan as the Heisei eruption, that began with phreatic explosions in November 1990 and continued until February 1995. On June 3, 1991, a large pyroclastic flow traveled about 4.5 kilometers from the crater and killed 43 people, including the volcanologists Katia and Maurice Krafft and Harry Glicken, along with sixteen journalists, twelve firefighters, and other residents and workers. Until the 2014 eruption of Mount Ontake, it was the deadliest volcanic disaster in postwar Japan.
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