A faint crater glow visible via telescope has been observed at Mayon Volcano in Albay in the past 24 hours, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said on Wednesday.
PHIVOLCS said one volcanic earthquake was also recorded.
Moderate plumes were also emitted from the crater. These drifted west-northwest and westward.
Mayon Volcano emitted 391 tons of sulfur dioxide on October 1, PHIVOLCS added.
Its edifice is also slightly inflated.
PHIVOLCS said Alert Level 1 (low-level unrest) remains in effect on Wednesday at Mayon Volcano.
It reiterated that the six-kilometer radius area around the volcano is a permanent danger zone and entry therein is not allowed.
Likewise, flying aircraft close to the volcano is prohibited.
PHIVOLCS said Mayon Volcano poses hazards such as sudden steam-driven or phreatic eruptions, rockfalls or landslides and avalanches, and lahars during heavy and prolonged rainfall. —KG, GMA News