Flights near Mayon Volcano in Albay remain restricted after the Civil Aviation Authority of the Philippines (CAAP) extended its aviation safety advisory for the area on Sunday.

In an advisory, CAAP said the extended Notice to Airmen (NOTAM) will be in effect from 7:47 a.m. on Sunday, 14 December, until 9:00 a.m. on Monday, 15 December, covering airspace from the surface up to 11,000 feet.

The aviation authority has been issuing and extending separate advisories since Wednesday, 10 December. Flight operators are advised to avoid flying aircraft near Mayon Volcano, which remains under Alert Level 1, or low-level unrest.

In its 24-hour bulletin issued by the Philippine Institute of Volcanology and Seismology (Phivolcs) as of 14 December, Mayon recorded one volcanic earthquake and eight rockfall events.

Sulfur dioxide emissions were measured at 307 tonnes per day on 10 December, with moderate plumes drifting west-northwest and west-southwest. The volcano’s edifice remains inflated.

Residents near the volcano were warned of possible hazards, including sudden steam-driven or phreatic eruptions, rockfalls or landslides, and lahar flows during heavy or prolonged rainfall.