The Philippine Institute of Volcanology and Seismology (Phivolcs) said a "weakening effusive activity" created a short incandescent lava flow from Mayon Volcano's summit crater.
Phivolcs observed the lava flow at 7:30 p.m. on Nov. 22.
Meanwhile, the Mayon Volcano Network had recorded one volcanic earthquake and 111 rockfall events on Thursday, Nov. 23, it said.
Phivolcs said the lava still flows at approximately 3.4 kilometers along Bonga gully, 2.8 kilometers along Mi-isi gully, and 1.1 kilometers along Basud gully.
Moreover, the volcanic sulfur dioxide (SO2) emission had an average of 1,623 tons per day as of Nov. 22.
Phivolcs advised the public to refrain entering the six-kilometer radius permanent danger zone and be vigilant against the risks from pyroclastic density currents, rockfalls, lahars, and sediment-laden streamflows among other volcanic hazards.
Hazardous eruption may still be expected in Mayon Volcano as Alert Level 3 is maintained, which means that it is currently "in a relatively high level of unrest,” it added.
