According to news articles, the Alert Level at Mayon was raised from 0 to 1 (on a scale of 0-5) after increased seismicity and gas emission were recorded. The amount of SO2 emitted increased from ~950 tons/per day during the previous week, to ~2,670 tons on 29 October. Residents near the volcano were notified that they must not enter the 6-km radius Permanent Danger Zone, especially on the SE side of the volcano.

Geological Summary. Symmetrical Mayon, which rises above the Albay Gulf NW of Legazpi City, is the most active volcano of the Philippines. The steep upper slopes are capped by a small summit crater. Recorded eruptions since 1616 CE range from Strombolian to basaltic Plinian, with cyclical activity beginning with basaltic eruptions, followed by longer term andesitic lava flows. Eruptions occur predominately from the central conduit and have also produced lava flows that travel far down the flanks. Pyroclastic flows and mudflows have commonly swept down many of the approximately 40 ravines that radiate from the summit and have often damaged populated lowland areas. A violent eruption in 1814 killed more than 1,200 people and devastated several towns.

Sources: Associated Press, ABS-CBN News