(Eagle News)– Four volcanic earthquakes were monitored at Mayon in 24 hours. The Philippine Institute of Volcanology and Seismology said also monitored at the volcano, which remains on alert level 1, were steam and sulfur dioxide emissions, and a crater glow. PHIVOLCS said the emission of white steam-laden plumes was moderate. Sulfur dioxide emission was last measured at 450 tons–below baseline average—on December 10. The crater glow was faint and was observed last night. According […]