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

21 reactions · 29 shares | PYROCLASTIC SURGE FROM MOUNT SEMERU WATCH: Video captured by a CCTV camera at 7x speed shows pyroclastic density currents, which consists of hot ash, gases, volcanic rocks and other materials, rushing downstream from Mount Semeru in East Java province, #Indonesia following an explosive eruption Wednesday evening, 19 November. | : CCTV Semeru HorizonTrack 19 November 2024 | HorizonTrack | Facebook

🇮🇩 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

99K views · 1.6K reactions | A breathtaking yet terrifying moment as Chile’s Calbuco Volcano unleashes a massive pyroclastic flow stretching over 7 km at sunset. The sky burns with fiery hues while ash clouds tower into the heavens, capturing the raw, unstoppable force of nature. A scene that reminds us how small we truly are before the power of the Earth. #Ethiopia #volcanoeruption #EpicEruption | Space Xplore | Facebook

WATCH: Effusive eruption at Mayon Volcano continues for the 23rd consecutive day, generating incandescent lava flows, pyroclastic density currents (PDC) or “uson,” and rockfall. Lava flows have reached radial distances from the crater of 3.7 km in the Basud (east), 1.6 km in the Bonga (southeast), and 1.3 km in the Mi-isi Gullies as of Thursday, Jan. 29, 2026. Alert Level 3 prevails over Mayon and entry into the 6-km Permanent Danger Zone must be prohibited. Courtesy: PHIVOLCS/X | GMA News