Philippines

Philippines: NDCC Update - Sitrep No. 14 Mayon Volcano update

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Situation Report
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DATE: 24 December 2009, 10:00 PM

Sources: DOST PHIVOLCS, DSWD, DON, DepEd, OCDRC-V, ALBAY PDCC, AFP, JTF MAYAN, DPWH V

I. SITUATION OVERVIEW

- Mayon Volcano is still under Alert Level 4. To ensure the safety of the public, PHIVOLCS-DOST is reiterating that the Extended Danger Zone from the summit of 8 km at the southern sector of the volcano and 7 km at the northern sector should be free from human activity.

A. Observations:

- Mayon Volcano continued to show an intense level of activity during the past 24-hour observation period

- Seismic activity remained elevated in number and size as the seismic network detected a total of eight hundred fifteen (815) volcanic earthquakes and recorded tremors and many of the volcanic earthquakes were recorded at maximum deflection. Twenty one (21) ash explosions were recorded during times of good visibility, with the ash columns reaching heights of up to 1.2 km above the summit

- One hundred twenty four (124) audible booming and rumbling sounds were intermittently heard for the past 24 hours

- Red hot lava continued to flow down along the Bonga-Buyuan, Milsi and Lidong gullies

- Measurement of Sulphur Dioxide (SO2) emission rate yielded a value of five thousand seven hundred thirty seven (5,737) tonnes/day

B. Recommendations

- Areas just outside of the EDZ should prepare for evacuation in the event explosive 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

II. PREPAREDNESS MEASURES

- At Alert Level 4, mandatory evacuation of 9,946 families/47,285 individuals staying along 6 km radius Permanent Danger Zone (PDZ) and the 6.8 km Extended Danger Zone (EDZ) in the southern quadrant particularly Buyuan, Mainit and Bonga areas has been imposed