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 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

WATCH: Time-lapse footage of lava effusion and collapse-fed pyroclastic density current (PDC) or uson from the Mayon Volcano summit crater recorded at 07:21 PM 13 February 2026. Effusive eruption at Mayon Volcano continues for the 39th consecutive day, generating incandescent lava flows, pyroclastic density currents (PDC) or “uson”, and rockfall. Lava flows have reached radial distances from the crater of ~3.8km in the Basud (east), ~1.6km in the Bonga (southeast), and ~1.3km in the Mi-isi Gulli