The Mayon in Albay province has logged two "short-lived gas bursts" accompanied by seismic and infrasound signals in the past 24 hours, said the Philippine Institute of Volcanology and Seismology, but noted it is still not an indication to raise the current alert level status of the volcano.

In its volcano bulletin on Saturday, Phivolcs said the Mayon volcano network recorded 31 volcanic earthquakes including 23 tremor events with a duration of 1 to 52 minutes, 1 pyroclastic density current event, and 87 rockfall events.

"Rockfalls and PDCs generated by the collapse of the summit dome deposited debris still within four (4) kilometers of the crater," the state seismology said.

The gas burst with a slow effusion of lava occurred at 06:36 p.m. on 20 October and 12:06 a.m. on 21 October, respectively.

Phivolcs said the lava flows maintained advances to approximately 3.4 kilometers in Bonga (southeastern), 2.8 km in Mi-isi (south), and 1.1 km in Basud (eastern) Gullies. The lava collapses up to 4 km from the crater.

The volcano emitted an average of 592 tonnes daily of sulfur dioxide on 20 October, with moderate emission of voluminous plumes at 1000 meters tall drifting south-southwest and west drift.

Phivolcs observed a short-term inflation of the Mayon's edifice.

The Alert Level 3 status is maintained over the Mayon volcano, indicating that it is currently in a relatively high level of unrest, and hazardous eruption within weeks or even days could still be possible.

Entering to the Mayon's 6-km radius Permanent Danger Zone remains prohibited due to the danger of PDCs, lava flows, rockfalls, and other volcanic hazards. Flying aircraft near the volcano is also not allowed.

"Increased vigilance against PDCs, lahars, and sediment-laden streamflows along channels draining the edifice is also advised," Phivolcs warned.