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OPEN-FILE REPORT

Philippine Institute of Volcanology and Seismology, Powered by Joomla!
MAYON VOLCANO BULLETIN 09 November 2014 8:00 A.M. PDF Print

Mayon Volcano’s current condition remains unstable due to slow but sustained ground deformation of the edifice by subsurface magma since the start of unrest this year.  This is indicated by sustained swelling or inflation of the edifice, as measured by precise leveling on October 20-27, relative to both the third week of October 2014 and baseline measurements beginning 2010. Electronic tilt data from the continuous network on the northwest flank similarly indicate continuing inflation of the edifice since August 2014, succeeding a previous inflation event in June to July 2014. These inflation events correspond to batches of magma (approximately 107 cubic meters) slowly being intruded at depth but that have yet to be erupted at the crater, and therefore posing threat of eventual hazardous eruption at an unknown time in the near future.

Mayon’s seismic network, however, detected four (4) volcanic earthquakes during the past 24 hours, consistent with overall slow, magma intrusion at depth that has characterized this year’s activity. Emission of white steam plumes was of moderate volume, with the steam drifting west-northwest, west-southwest and southwest. Crater glow was not observed last night, while sulfur dioxide (SO2) emitted at the crater averaged 84 tonnes/day on 08 November 2014, which is below the baseline level during normal periods. The visual and gas parameters may denote either poor magma degassing or the generally low gas content of intruding subsurface magma. Seismicity, visual and gas parameters, however, may suddenly change within a few hours or days should magma breach the surface in an eventual eruption.

Mayon Volcano’s alert status remains at Alert Level 3. At this present stage, potentially eruptible magma has already been intruded and continues to be intruded beneath the edifice. At any given time in the following weeks to months, this magma can eventually be erupted quietly as lava flows or explosively as vertical eruption columns and pyroclastic flows or both. It is strongly recommended that the 6-km radius Permanent Danger Zone (PDZ) around the volcano and the 7-km Extended Danger Zone (EDZ) on the southeastern flank be enforced due to the danger of rock falls, landslides and sudden explosions or dome collapse that may generate hazardous volcanic flows. PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.