When a volcano erupts, pyroclastic flows are often the biggest danger to anyone nearby. These fast-flowing currents of rock, ash and hot gas are extremely difficult to study, so researchers created their own. Read the related Nature Geoscience paper here: https://go.nature.com/2Im1bYs | Nature Portfolio

Pyroclastic flows from Unzen were generated by gravitational collapse of the growing lava dome, near the city of Shimabara, Nagasaki (1991). 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 zone of Kita-kamikoba on the eastern foot of the volcano.The velocities of the flows ranged from 15 to 25 m/s on the gentle middle flank. Scientific paper: http://link.springer.com/article/10.1007/BF00301514#page-1 Other detai

1.5K reactions · 234 shares | PYROCLASTIC FLOW A pyroclastic flow is...

🇮🇩 Pyroclastic Flow on Mount Semeru 🌋🔥🌫On January 15, 2026, a pyroclastic flow descended from Mount Semeru (Java, Indonesia). Hot gases, ash, and rock fragments rushed down the slopes, covering nearby areas. Authorities declared a heightened danger level, advising residents to evacuate from the hazardous zone. Preliminary reports indicate that information on casualties is still being verified. #Indonesia #Semeru #volcano #pyroclasticflow #weather | Val Sab