Mayon emitted ash on Friday, July 17, causing at one point a plume rising 2000 meters from the crater, the Philippine Institute of Volcanology and Seismology said.
PHIVOLCS said the ash emission is from the "continuing advance and collapse of the toe of a new lava flow at the Mi-si Gully.."
A total of 196 volcanic earthquakes, including 51 volcanic tremors were also monitored,
The tremors, PHIVOLCS said, lasted five to 31 minutes long were also monitored.
A total of 251 rockfall and 16 pyroclastic density current signals were also posted, with sulfur dioxide flux pegged at 4814 tons.
PHIVOLCS said entry into the 6-kilometer radius Permanent Danger Zone should remain prohibited.
Aircraft should also not be allowed to fly close to the volcano, PHIVOLCS said.
Mayon remains under Alert Level 3.
