PHIVOLCSPhilippine Institute of Vulcanology and Seismology
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According to PHIVOLCS Earthquake Intensity Scales, an intensity II tremor means the quake is felt by few individuals at rest indoors, and it causes hanging objects to swing slightly, and still water in containers to oscillate noticeably.
On Saturday, PHIVOLCS said it detected 13 volcanic earthquakes and 68 rockfall events from Mayon, as well as weak white steam emission from the summit crater.
moderate seismicity, high volcanic gas outputs and continuing glow of the summit (is) normally associated with very gradual return to the repose period," PHIVOLCS said in its bulletin.
said that "this orientation/seminar on the role of PAGASA and PHIVOLCS in Disaster Risk Reduction and Management (DRRM) and climate change adaptation is very timely.