Mayon Volcano logged nine pyroclastic density current signals or uson and 428 rockfalls in the past 24 hours, according to a bulletin of the Philippine Institute of Volcanology and Seismology (PHIVOLCS) Monday.

Mayon Volcano in Albay had 51 volcanic earthquakes on Friday, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said Saturday.

A map issued by the Philippine Institute of Volcanology and Seismology on Saturday, May 16, 2026, shows the location of volcanic earthquakes over the past 24 hours. — Photo from

Mayon Volcano logged nine pyroclastic density current signals or uson and 428 rockfalls in the past 24 hours, according to a bulletin of the Philippine Institute of Volcanology…

State volcanologists on Monday night recorded an episode of lava effusion with collapse-fed pyroclastic density currents (PDCs) or “uson” from Mayon Volcano.