MANILA (Philippine Daily Inquirer/ANN): The Philippine Institute of Volcanology and Seismology (Phivolcs) on Wednesday (Feb 5) said that the summit crater of the Mayon volcano has been detected having a crater glow in the past two days.
In a 4pm bulletin, Phivolcs said that the crater glow was likely caused by hot magmatic gases heating the overlying atmosphere.
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