Mayon Volcano Bulletin

16 September 2006

8:00 AM

Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected 2 volcanic earthquakes, 31 tremor episodes and continuous occurrence of “low frequency harmonic tremor” during the past 24 hour observation period. The Sulfur Dioxide emission rate of the volcanic plume was lower at 1,400 tonnes per day (t/d) compared to 1,600 t/d recorded the other day.  Intermittent discharge and tumbling down of incandescent lava fragments from the summit characterized on-going surface activity.  Steaming was moderate with white plumes drifting southeast to northeast

Alert Level 3 remains hoisted over Mayon Volcano, which means that Mayon is still at a high level of unrest.  Sudden ash explosions and secondary pyroclastic flows arising from the collapse of lava fragments may occur suddenly without warning.  PHIVOLCS reminds the public that the prevailing Extended Danger Zone (EDZ) encompassing the southeast sector is 7 kilometers from the summit crater, while the 6 kilometer-radius Permanent Danger Zone (PDZ) for all other areas around the volcano should likewise remain off-limits.