The volcano, located in the Albay province of central Philippines, first spewed ash on Saturday afternoon and again on Sunday morning.
Since the eruptions, a “faint crater glow” has been observed, while the “rockfall events have been intermittently recorded and are continuing” according to the Philippine Institute of Volcanology and Seismology (Phivolcs).
A statement from the agency read: “The public is strongly advised to be vigilant and desist from entering the six kilometre (3.7 mile) radius Permanent Danger Zone to minimize risks from sudden explosions, rockfall and landslides.”
Saturday’s eruption unleashed ash, rocks and sulfuric odour, and was followed by rumbling sounds and a faint glow in the crater.
Phivolcs raised the alert to level 2 in the early hours of Sunday, which means that the current activity is “probably of magmatic origin, which could lead to more phreatic eruptions or eventually to hazardous magmatic eruptions.”
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A second ash eruption was recorded before noon on Sunday, but Phivolcs said in a subsequent bulletin that it was maintaining alert level 2.
Mayon’s most destructive eruption was in February 1841, when lava flows buried a town and killed 1,200 people.
It last erupted in 2014, spewing lava and forcing thousands of people to evacuate.
“The public is strongly advised to be vigilant and desist from entering the six kilometre (3.7 mile) radius Permanent Danger Zone to minimize risks from sudden explosions, rockfall and landslides,” Phivolcs said.
It advised people experiencing ashfall to cover their noses and mouths with a damp, clean cloth or dust mask. It also said aircraft must avoid flying close to the volcano’s summit.
Those within the slope of the volcano, but outside the 6-km danger zone, were told to take precautionary measures against possible roof collapses due to accumulated ash and rainwater.
Phivolcs chief Renato Solidum said the volcano appeared due for another eruption as it has been displaying abnormal behaviour since late last year.
But Cedric Daep, head of the Albay Provincial Disaster Risk Reduction and Management Office, said those in evacuation centers may be allowed to return to their homes later in the day, unless Phivolcs raises the volcano alert level further.
He said not all residents evacuated live inside the 6-km danger zone.
“We have not reached the critical level,” he said in a radio interview. “Alert level 3 is what we considered critical, 4 is when eruption is imminent, and 5 is eruption in progress.”
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