PHIVOLCS reported that during 7-13 February activity at Mayon continued to be characterized daily by lava effusion from the summit crater, rockfalls, lava fountains, steam emissions, advancing lava flows on the flanks, and pyroclastic flows.
Numerous rockfall events were generated from the front and margins of advancing lava flows.
Lava fountaining was nearly continuous during 6-10 February, with around 290 lava-fountaining events recorded by the seismic network from 0557 on 5 February until around 0700 on 10 February.
The events each lasted between 3 and 233 minutes, and were accompanied by rumbling sounds audible with a 10-km radius.
Lava fountaining was sporadic during 11-13 February.
Lava fountains during phases of both nearly continuous and sporadic activity rose as tall as 400 m, and produced steam plumes up to 2.5 km above the crater that drifted in multiple directions.
Lava flows advanced to 3.3 km, 4.5 km, and 900 m in the Mi-isi (S), Bonga (SE), and Basud (E) drainages, respectively.
Pyroclastic density currents traveled 4.2-4.6 km in the Mi-isi, Bonga, and Basud drainages.
The Alert Level remained at 4 (on a 0-5 scale) and the public was warned to remain outside of the Danger Zone defined as an area within an 8-km radius.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)