The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported Tuesday that activity at Mayon Volcano has decreased in the last 24 hours, with one volcanic earthquake and 221 rockfall events recorded.
Teresito Bacolcol, director of PHIVOLCS, stated that the solitary low-frequency volcanic quake reported between June 12 and June 13 was a drop from the 21 volcanic quakes recorded between June 11 and June 12.
Meanwhile, the number of rockfalls on Mayon Volcano has decreased from 260 to 221.
In addition, only one pyroclastic density current incident was recently recorded, as opposed to the prior three.
Despite these changes, Bacolcol emphasized that the Mayon Volcano had not yet cooled down, and at around 5:00 a.m., a fair crater glow was still apparent to the human eye, emitting a moderate plume that drifted northeast while the Mayon Volcano's edifice was being inflated on Tuesday.
On Monday, it produced 723 metric tons of sulfur dioxide. The PHIVOLCS department continued to remind the public that entering the six-kilometer radius of Mayon Volcano's Permanent Danger Zone (PDZ) is prohibited.
Moreover, the Albay provincial government extended the danger zone around Mayon Volcano to seven kilometers on Monday because of "increasing unrest."
Flying any aircraft close to Albay's active volcano is also prohibited.
During severe and prolonged rainfall, hazards such as rock falls, landslides, avalanches, ballistic fragments, lava flows and lava fountaining, pyroclastic density currents, moderate-sized explosions, and lahars may occur.
Mayon Volcano is now on Alert Level 3 owing to "intensified unrest" or magmatic instability.
On Sunday night, there was lava flow activity encompassing at least 500 meters from the summit crater along the Bonga and Miisi Gullies.
According to the National Disaster Risk Reduction and Management Council (NDRRMC), more than 14,000 residents have already been evacuated as of June 12 due to the ongoing unrest at Mayon Volcano.
