Mayon Volcano Bulletin

15 September 2006

9:00 AM

For the past 24 hours, Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network recorded 12 volcanic earthquakes, 104 tremor episodes and continuous occurrence of “low frequency harmonic tremor” since 6:08 PM yesterday. This is likely caused by vibration/resonance produced by pressurized movements of magma at depth. The Sulfur Dioxide emission rate of the volcanic plume was estimated at 1,600 tonnes per day (t/d) as against yesterday’s 1,500 t/d. Surface activity was characterized by intermittent discharge of incandescent lava fragments and intense glow from the summit crater.  Steaming was moderate with white plumes drifting southwest to east-southeast.

Alert Level 3 remains in effect over Mayon Volcano, which means that Mayon is still at an elevated state of unrest.  PHIVOLCS reminds the public that the prevailing Extended Danger Zone (EDZ) is 7 kilometers from the summit crater, covering the southeast sector, while the normal 6 kilometer-radius Permanent Danger Zone (PDZ) for all other areas around the volcano should likewise remain off-limits.