Mayon Volcano Bulletin

24 September 2006

8:00 AM

Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected six (6) volcanic earthquakes and 21 tremor episodes and occurrence of low frequency harmonic tremors.  Surface activity was characterized by intense crater glow at the summit but intermittent extrusion and rolling of incandescent lava from the crater was not observed.  The decrease of tremor episodes signified the continuing decline in lava extrusion.  Steaming from the crater was not observed due to thick clouds at the summit area.

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).