LEGAZPI CITY – Mount Mayon has again showed signs of restiveness three years after its last explosion, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.

Phivolcs warned residents to stay out of the six-kilometer permanent danger zone and the seven-kilometer extended danger zone as the volcano showed signs of abnormality manifesting an intense crater glow and volcanic earthquakes for the past 24 hours observation period.

Dr. Ed Laguerta, Phivolcs resident volcanologist, said the agency instruments detected intensity 2 crater glow occurrences since Sunday, while 18 volcanic quakes were recorded by seismic networks.

Laguerta, however, said the parameters were not indicators to raise the volcano's alert status, Mayon volcano remains at Alert Level 1 meaning eruption is unlikely to occur.

The volcano's recent seismic abnormality prompted the Albay Provincial Disaster Coordinating Council (PDCC) to reactivate it’s “no mans land” in areas designated as danger zone due to the continuing threat from sudden small explosions and rock falls from the upper slopes.

Gov. Joey Salceda, PDCC chairman, said he has advised city and town disaster councils with villages along the slopes of the volcano to be on alert in case the volcano's conditions worsen.

In 1993, at least 77 people died when Mayon Volcano erupted. (with reports from PNA/Sunnex)