Mayon Volcano Bulletin

20 September 2006

8:00 AM

For the past 24-hours, Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network recorded one volcanic earthquake and 33 tremor episodes. Low frequency harmonic tremor continued to occur during the observation period. The Sulfur Dioxide emission rate of the volcanic plume was estimated at around 1200 tonnes/day as against yesterday’s 1,500 tonnes/day.

Surface activity was characterized by intermittent rolling of incandescent lava fragments and crater glow coming from the summit crater. Steaming activity from the volcano’s summit was moderate with white steam plumes drifting north-northeast and southeast.

The persistent occurrence of low frequency tremor still indicates elevated unrest of Mayon Volcano. Hence, Alert Level 3 remains in effect, which means that the new Extended Danger Zone (EDZ) of 7 kilometers from the summit crater covering the southeast sector and the normal 6 kilometer-radius Permanent Danger Zone (PDZ) for all other areas around the volcano should remain off-limits.