Mayon Volcano Bulletin

22 September 2006

8:00 AM

Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected 2 volcanic earthquakes, 80 tremor episodes and continuous occurrence of low frequency harmonic tremors during the past 24 hours. The Sulfur Dioxide emission rate of the volcanic plume decreased to about 1,600 tonnes per day (t/d) from 2,200 t/d the other day.   Intermittent extrusion of incandescent lava from the crater was still observed. The volcanic quakes and low frequency tremors represent movement of magma inside the volcano while some tremor episodes reflect lava extrusion. Steaming from the crater was moderate with white plumes drifting northeast to north-northeast.

Alert Level 3 remains hoisted over Mayon Volcano, which means that the volcano is still at a high level of unrest. Ash explosions from the crater and secondary pyroclastic flows arising from the collapse of lava fragments may occur suddenly. PHIVOLCS reminds the public that the following zones should remain off-limits: the Extended Danger Zone (EDZ), which is the area in the southeast sector up to 7 kilometers from the summit crater, and for all the other areas around the volcano, the 6 kilometer-radius Permanent Danger Zone (PDZ).