State volcanologists recorded multiple rockfall events at Mayon Volcano, including one captured on camera morning on Wednesday, December 17, 2025, according to DOST-PHIVOLCS.

PHIVOLCS said a rockfall occurred at 9:29 a.m. after lava detached, or spalled, from the summit crater. The rocks traveled down the Mi-isi Gully on the south-southeast side of the upper slopes and stopped within one kilometer of the summit.

In its latest bulletin, PHIVOLCS said Mayon remained under Alert Level 1. From 12 a.m. Tuesday to 12 a.m. Wednesday, instruments recorded one volcanic earthquake and more than 10 rockfall events. 

Crater glow was obscured, while sulfur dioxide emission measured 307 tonnes per day as of December 10. 

The volcano released a moderate plume that drifted west-southwest, and ground deformation data showed that the volcano’s edifice remained inflated.

PHIVOLCS advised the public to avoid entry strictly into the six-kilometer Permanent Danger Zone. Entry into the extended danger zone without proper vigilance was also not allowed. Authorities also banned aircraft from flying close to the volcano.

Earlier, authorities in Albay held an emergency meeting on Tuesday, December 16, as Mayon showed increased activity.

The Albay Provincial Safety and Emergency Management Office (APSEMO) met with local disaster officials to review evacuation plans, manpower readiness, and logistical support.

Officials said they continued to closely monitor the situation, noting that recent activity showed similarities to signs observed before Mayon’s 2023 eruption.