Mayon Volcano Bulletin

04 September 2006

8:00 AM

Lava continued to ooze out of Mayon’s summit crater (13.2576^oN, 123.6856^oE), which resulted in 305 tremor episodes for the past 24 hours. Lavas and the detaching lava blocks continuously cascaded towards the southeast sector of the volcano. Majority of the extruded lavas were observed overriding the Mabinit lava flow deposit and the rest were seen rolling down the Miisi and Buyoan channels. Eleven (11) volcanic earthquakes were also detected. These signify magma ascent and its degassing activity.

The Sulfur Dioxide (SO₂) flux of the volcanic plume slightly increased to 2,961 tonnes per day (t/d) yesterday from the other day’s 2,021 t/d.  Moderate volume of white to dirty white steam column was observed drifting west-southwest yesterday afternoon and early this morning.

The parameters still indicate a high level unrest for Mayon Volcano. Hence, PHIVOLCS maintains Alert Level 4 over the volcano. This means that the 8-kilometer radius Extended Danger Zone (EDZ) over the southeast should be strictly off-limits. For other areas around the volcano, the presently enforced EDZ is 7 kilometers from the summit.