LEGAZPI CITY — The Philippine Institute of Volcanology and Seismology (Phivolcs) on Monday recorded the highest number of volcanic earthquakes since the latest unrest of Mayon Volcano began on Jan. 6, prompting authorities to maintain Alert Level 3 over the volcano. In its latest bulletin, Phivolcs reported 539 volcanic earthquakes in the past 24 hours, […]... Keep on reading: Mayon Volcano unrest: 539 quakes recorded in 24 hours - Phivolcs