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

BREAKING: MAYON VOLCANO ALERT LEVEL 3 TO BE RAISED DUE TO PYROCLASTIC DENSITY CURRENTS (PDCs) ‼️🌋 ALBAY, Philippines — The Philippine Institute of Volcanology and Seismology (PHIVOLCS) announced on Tuesday, January 6, 2026, that the alert status for Mayon Volcano will be elevated to Alert Level 3. This decision follows the detection of dome collapse Pyroclastic Density Currents (PDCs), locally known as "uson." The escalation signifies a high level of volcanic unrest, as magma is likely at or ne