Vesiculation and Microlite Crystallization Induced by Decompression: A Case Study of the 1991-95 Mt Unzen Eruption (Japan) July 2011 Journal of Petrology 52(7-8):1469-92 Mount Unzen and Mount Pinatubo are contrasting cases. The pre-eruptive processes of the 1991–1995 Unzen eruption have been reconstructed using the results of this study. During a previous eruption in 1792 15, 000 people perished. Unzen, Japan in 1991 to 1995: Modeling with the chemical composition of volcanic gas, Journal of Volcanology and Geothermal Research, 10.1016/j.jvolgeores.2008.03.040, 175, 1-2, (120-132), (2008). First, prior to the eruption, three magmas (HT, MT, and LT magmas) were present. Unzen near Nagaski in Japan, had been predicted from scientific monitoring. Mount Unzen, Japanese Unzen-dake, volcano on central Shimabara Peninsula, western Kyushu, Japan.Mount Unzen is actually a group of composite volcanoes, the highest of which is Mount Fugen, at 4,462 feet (1,360 m). A dacitic magma (64.5 wt.% SiO 2 ), a mixture of phenocryst-rich rhyodacite and an aphyric mafic magma, was erupted during the recent 1991-1995 Mount Unzen eruptive cycle. A lava dome appeared in May 1991 and began producing pyroclastic flows. Mount Unzen 1991 Mount Unzen in Japan had been dormant for nearly 200 years when increasingly frequent earthquakes,small steam and ash eruptions heralded the start of an active phase. Catherine Joséphine "Katia" Krafft (née Conrad; 17 April 1942 – 3 June 1991) and her husband, Maurice Paul Krafft (25 March 1946 – 3 June 1991), were French volcanologists who died in a pyroclastic flow on Mount Unzen, in Japan, on June 3, 1991.The Kraffts were known for being pioneers in filming, photographing and recording volcanoes, often getting within feet of lava flows. The Kraffts were known for being pioneers in filming, photographing and recording volcanoes, often getting within feet of lava flows. After May 1991, frequent incidence of debris flow and pyroclastic flow caused disasters. LATEST NATIONAL STORIES 4.5. The first, of Mt. Katia Krafft and Maurice Krafft were French volcanologists who died in a pyroclastic flow on Mount Unzen, in Japan, on June 3, 1991. Unzen-Fuzen which started in November 1990 continued until February 1995. The 1991–1995 eruption products of the Unzen volcano show limited variations in petrography and bulk rock chemistry (Nakada and Motomura, 1999).The SiO 2 contents range from 64–66 wt.%, and total phenocryst contents vary from 20 to 30 vol.%. While evacuation warning was issued to secure human safety against the pyroclastic flow, 43 Mount Unzen resumed volcanic activities Nov. 17, 1990, after being dormant for 198 years. Source - Worth the watch. Local authorities announced the end of volcanic activity at the mountain in June 1996. Mt. Of those, Mount Unzen has been the most threatening, having already killed 38 people and evoking memories of its last eruption, in 1792. The governemnt issued an evacuation order and definded a restricted zone. Once a pyroclastic flow occurs, evacuation is no more possible. Mount Unzen underwent a major eruption in 1792 that killed as many as 15,000 people in what was probably the worst volcanic disaster in Japan’s history. Phenocryst phases are plagioclase, magnesiohornblende, biotite, quartz, magnetite, ilmenite, apatite, and rare orthopyroxene and … The experimental and analytical results of this study reveal additional details about conditions in the premixing and postmixing magmas, and the nature of the mixing process. The HT endmember magma intruded into the MT magma chamber and triggered the eruption. 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