What are lahars and pyroclastic flows?

Pyroclastic Flow | Overview & Materials

LOOK: Time-lapse footage of Mayon Volcano’s summit shows pyroclastic density currents (PDCs) generated by lava dome collapse at 1:16 PM and 4:09 PM, according to PHIVOLCS. The agency also recorded a total of 16 PDC events between 12:26 PM and 4:30 PM on January 7, 2026, producing grayish to brownish ash clouds that rose up to 200 meters drifting east-northeast. Alert Level 3 remains while entry into the 6km Permanent Danger Zone is prohibited. Courtesy: PHIVOLCS/Facebook | GMA News

🇮🇩 Pyroclastic Flow Descends from Mount Merapi, November 26, 2025 🌋 On 26 November 2025, a pyroclastic flow descended from Mount Merapi, one of Indonesia’s most active volcanoes. The dangerous mixture of superheated gases, ash, and rock fragments rushed down the southern and southeastern slopes. According to preliminary reports, authorities have raised the alert level and warned residents about a possible expansion of the danger zone. Ash emissions are disrupting airline operations and posing

NEWBORN LAVA DOME SPOTTED AT MAYON VOLCANO AS PYROCLASTIC FLOW OCCURS A newborn dark lava dome was observed at the summit of Mayon Volcano as it released a pyroclastic density current (PDC), or “uson,” at around 11:40 AM on Jan. 8. A total of 49 PDCs have been recorded at the volcano since this morning. Alert Level 3 remains in effect over Mayon, and entry into the 6-kilometer Permanent Danger Zone is strictly prohibited. 📷: PHIVOLCS | GMA Public Affairs