Mayon Volcano Bulletin

Light ashfall was experienced by several areas to the south of Mayon (13.2576°N, 123.6856°E) as variable surface winds carried fine ash to Daraga, Legazpi City and vicinity. These trace ash deposits were primarily derived from the lava flowing through the Mabinit channel. The front of this slowly moving lava mass has reached the 320-meter elevation which corresponds to approximately 5.4 aerial kilometers from the crater. Smaller flows and incandescent blocks of lava were observed entering adjacent gullies towards the general directions of Miisi, Mabinit, Bonga, Matanag and Buyoan.

Steam and volcanic gas emission from the summit crater was still voluminous. The Sulfur Dioxide (SO₂) emission rate was measured at about 6,099 tonnes per day, which reflected active degassing from the crater area.

The seismic network recorded about 394 tremor episodes and four (4) volcanic earthquakes during the past 24 hours. These tremors were caused by near-continuous lava blocks detaching from the lava flows while the earthquakes were likely caused by ascending magma inside the volcano.

Mayon Volcano remains at a high level of unrest with fair probability for explosive eruptions. Alert Level 3 remains in effect, which means that the 6-kilometer radius Permanent Danger Zone (PDZ) around the volcano should be off-limits. As lava encroaches the southeast PDZ boundary, which coincides with a wooded area, the threat from fire becomes high. This risk may be amplified by surface winds blowing south. The public is therefore advised to keep a fair distance while residents of Barangays Mabinit, Miisi, Bonga, Matanag and Buyoan should be prepared for evacuation.

PHIVOLCS-DOST

--/CSS/EGC