The Philippine Institute of Volcanology and Seismology (PHIVOLCS)  said volcanic activity continued at Mayon Volcano over the past 24 hours with increased rockfall events but fewer volcanic earthquakes and pyroclastic density current signals.

In its latest bulletin, PHIVOLCS said 297 rockfall events were recorded, which is higher compared to 283 in the previous report on Wednesday.

A total of 10 volcanic earthquakes were recorded, which is lower than the 11 in the previous report on Wednesday. The recent volcanic earthquakes lasted longer, up to 34 minutes. However, the number of daily volcano tremors increased from three to six.

Pyroclastic density current signals or “usons” also declined from 17 to two, according to the PHIVOLCS.

Lava effusion with lava flow remained on Basud (3.8 kilometers), Bonga (3.2 km) and Mi-isi (1.6 km) gullies, with episodic minor strombolian activity.

Mayon emitted a weak plume rising 300 meters above the crater and drifting northwest and west-southwest.

Crater glow remained visible and was described as “fair.”

Sulfur dioxide emissions averaged 2,184 tonnes per day based on measurements on Tuesday.

There was a short-term deflation of the edifice with shorter-term inflation on the northeastern flank of the volcano, according to PHIVOLCS.

Alert Level 3 is maintained over Mayon Volcano, which means there is an intensified unrest or magmatic unrest.