Mayon Volcano in Albay had shown signs of intensified or magmatic unrest in the past 24 hours with emission of more sulfur dioxide and lava flows continuing on in its crater Sunday.
The Philippine Institute of Volcanology and Seismology (Phivolcs) noted an average of 2,379 tons of volcanic sulfur dioxide on Saturday.
Early the following day, the volcano manifested lava ejection lasting 35 seconds, accompanied by seismic and infraround signals with a slow effusion of lava from the summit crater over the past 24 hours.
This fed the lava flows on the Bonga gully on the southeastern side, the Mi-isi gully on the south side and the Basud gully on the eastern side of the volcano.
The lava flow remained at approximately 3.4 kilometers from the crater on the Bonga gully, 2.8 kilometers on the Mi-isi gully, and 600 meters on the Basud gully, Phivolvcs said.
“Rockfall and pyroclastic density currents or PDCs generated by collapses of the lava flow margins as well as of the summit dome deposited debris still within four (4) kilometers of the crater,” Phivolcs said.
There was a total of 92 low-frequency volcanic earthquakes, 92 tremor events lasting two to nine minutes, one pyroclastic density current and 152 rockfall events.
The six-kilometer permanent danger zone should remain evacuated due to the threat of PDCs, lava flows, rockfalls, and other volcanic hazards, Phivolcs said.