Katia Krafft died at age 49 in a pyroclastic flow during the eruption of Mount Unzen, Japan, on 3 June 1991, alongside her husband Maurice.
On 3 June 1991, Katia Krafft died at the age of 49 during the eruption of Mount Unzen in Nagasaki Prefecture, Japan. She was killed instantly, along with her husband Maurice Krafft and American volcanologist Harry Glicken, when a fast-moving pyroclastic flow — a superheated avalanche of gas, ash, and rock — swept down the volcano's slopes. In total, 43 people died in the disaster, including journalists and local residents who had gathered to observe the eruption.
The Kraffts had traveled to Unzen specifically to document the eruption at close range, continuing their decades-long practice of embedding themselves near active volcanic activity to capture unprecedented footage and data. Tragically, the very proximity that had made their work so scientifically and visually valuable also proved fatal, as pyroclastic flows can travel at speeds exceeding 100 km/h with temperatures reaching hundreds of degrees Celsius, leaving little chance of escape.
Katia's death, alongside Maurice's, sent shockwaves through the international volcanological community and the public who had come to know the couple through their films, books, and media appearances. Their deaths prompted increased attention to the risks faced by scientists working in extreme environments and contributed to evolving protocols around volcanic hazard zones and evacuation planning.
Their legacy endures: the couple is widely credited with having saved thousands of lives by advocating for evacuation policies based on direct observational science, an impact that persisted well beyond their deaths and was later dramatized in the acclaimed 2022 documentary Fire of Love.