The Philippine Institute of Volcanology and Seismology (Phivolcs) has recorded a total of 372 rockfall events in Mayon Volcano, Albay in the past 24 hours.
Based on its 8 a.m. bulletin, the Phivolcs said the sulfur dioxide emission from the volcano increased to 964 tons on Tuesday from 753 tons on Monday.
The lava flow from the crater along Mi-isi gully also grew to 1.6 kilometers on Wednesday from 1.3 kilometers on Tuesday.
The number of rockfall events was higher compared to the 241 rockfall events reported on Tuesday, Philvolcs said.
“Alert Level 3 is maintained over Mayon Volcano, which means that it is currently in a relatively high level of unrest as magma is at the crater and hazardous eruption within weeks or even days is possible,” Phivolcs maintained.
“It is therefore recommended that the six-kilometer radius permanent danger zone be evacuated due to the danger of pyroclastic density currents, lava flows, rockfalls and other volcanic hazards,” it cited.
Only one volcanic earthquake was detected over the volcano, while seven dome-collapse PDC events were also observed.
A very slow effusion of lava flow from the crater was seen along Bonga gully extending up to 1.2 kilometers.
Lava collapse was also observed on Mi-is and Bonga gullies within 3.3 kilometers from the crater.
A moderate emission of plumes reaching up to 800 meters was observed from the volcano, drifting to the west-northwest.