MANILA, Philippines ---The Philippine Institute of Volcanology and Seismology (Phivolcs) recorded 185 rockfall events and 18 volcanic earthquakes in Mayon Volcano over the past 24 hours. Two pyroclastic density currents (PDC) were also reported, the agency added. "Rockfall and PDCs generated by collapses of the lava flow margins as well as of the summit dome deposited debris still within four (4) kilometers of the crater," Phivolcs said on Thursday. The agency likewise detected a 2,252-ton sulfur dioxide emission from the volcano on Wednesday. Moreover, the effusion of lava from the summit crater remains "slow" as it continues to reach the established la...Keep on reading: Mayon logs 185 rockfall events, 18 volcanic quakes in 24 hours