Mayon’s alert level back to ‘normal’

Helen Flores - The Philippine Star

MANILA, Philippines — The Philippine Institute of Volcanology and Seismology (Phivolcs) lowered yesterday the alert status of Mayon Volcano in Albay from Level 1 or abnormal to 0 or normal.

Phivolcs said there has been a continued decline in monitoring parameters of the volcano since the alert level was downgraded from 2 to 1 on July 17 last year.

The frequency of volcanic earthquakes declined to baseline levels or zero to five events per day in the last six months, it added.

Phivolcs said this means that rock fracturing within the volcanic edifice associated with magmatic or hydrothermal activity has diminished.

It said data from global positioning systems and campaign electronic distance measurement and precise leveling monitoring collectively tracked a slight and decreasing rate of inflation of the edifice of the volcano this year and continued deflation of its southwest slopes since 2018.

Sulfur dioxide emission declined below the baseline level of 500 tons per day since July 14.

Phivolcs said faint crater glow or incandescence associated with superheated gas emission at the summit vent continues to be observed but only through a camera.

Plume emission from the crater has been weak to moderate this year, it added.

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