|Mayon Volcano Bulletin 15|
|Monday, 28 December 2009 16:18|
For the past 24 hours, Mayon Volcano’s (13.2576 N, 123.6856 E) intense level of unrest persisted. Seven ash explosions were observed during times of good visibility. The explosions produced dirty white to light gray ash columns that rose to a maximum height of about 2000 meters above the summit before drifting towards the southwest.
A total of 44 volcanic earthquakes and 137 rock fall events related to the detachment of lava fragments at the volcano’s upper slopes was detected by the seismic network. Red hot lava continuously flowed down along the Bonga-Buyuan, Miisi and Lidong gullies. Intermittent rolling of incandescent lava fragments were also observed. Yesterday’s measurement of sulfur dioxide emission rate increased to 4,329 tonnes per day (t/d) from the previous 2,304 t/d.
Alert Level 4 remains hoisted over Mayon Volcano. PHIVOLCS-DOST reiterates that the Extended Danger Zone (EDZ) from the summit of 8-km on the southern sector of the volcano and 7-km on the northern sector should be free from human activity. Areas just outside of this EDZ should prepare for evacuation in the event hazardous eruptions intensify. Active river channels and those perennially identified as lahar prone in the southern sector should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall. PHIVOLCS–DOST is closely monitoring Mayon Volcano’s activity and any new significant development will be immediately posted to all concerned.