Pyroclastic flows from the 1991 eruption of Unzen volcano, Japan

  title={Pyroclastic flows from the 1991 eruption of Unzen volcano, Japan},
  author={Takahiro Yamamoto and Shinji Takarada and Shigeru Suto},
  journal={Bulletin of Volcanology},
Pyroclastic flows from Unzen were generated by gravitational collapse of the growing lava dome. As soon as the parental lobe failed at the edge of the dome, spontaneous shattering of lava occurred and induced a gravity flow of blocks and finer debris. The flows had a overhanging, tongue-like head and cone- or rollershaped vortices expanding outward and upward. Most of the flows traveled from 1 to 3 km, but some flows reached more than 4 km, burning houses and killing people in the evacuated… 
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