LEGAZPI CITY – The Philippine Institute of Volcanology and Seismology (Phivolcs) recorded an “abrupt rise” in sulfur dioxide (SO₂) emissions from Mayon Volcano on Monday, suggesting the possibility of renewed eruptive activity. In an advisory, Phivolcs said SO₂ emissions from the summit crater reached a very high rate of 8,393 tonnes per day, just days
