Philippines

Philippines: NDCC Update - Sitrep No. 17 Mayon Volcano update

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DATE: 27 December 2009, 11:00 PM

Sources: DOST-PHIVOLCS, DSWD, DOH, DepEd, OCDRC-V, ALBAY PDCC, AFP, JTF MAYON, DPWH V

l. SITUATION OVERVIEW

- Alert Level 4 remains hoisted over Mayon Volcano which means that a hazardous eruption is possible within days. PHIVOLCS-DOST reiterates that the Extended Danger Zone (EDZ) from the summit of eight kms at the southern sector of the volcano and seven kms at the northern sector should be free from human activity

A. Observations:

- Mayon Volcano (13.2576 N, 123.6856 E) continued to exhibit a high level of activity during the past 24-hour observation period.

- Nine (9) ash explosions accompanied by rumbling sounds were observed during times of good visibility. The explosions produced dirty white to brownish ash columns with lava fragments that reached the heights from 800 to 1,000 meters above the summit.

- A total of 44 volcanic earthquakes were detected by the seismic network and 297 rock fall events related to the detachment of lava fragments at the volcano's upper slopes.

- Flowing red hot lava and rolling incandescent lava fragments temporarily slowed down after the 10:52 AM explosion earthquake yesterday and resumed early morning today after the 4:30 AM ash explosion.

- The apparent brief lull was reflective of the decrease in the sulfur dioxide emission rate from the previous 8,993 tonnes per day to yesterday's measurement of 2,304 tonnes per day .

- Electronic tilt meter measuremenets at the northwest slope of Mayon volcano indicate that the edifice remained inflated despite the high volume of lava extruded since the start of the eruption on December 14, 2009

B. Recommendations

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

(Extract)

III. AFFECTED/DISPLACED POPULATION (Tab A)

- As of 11:00 AM, 27 December 2009, the number of evacuees staying in 29 evacuation centers is 10,032 families/47,563 persons

- Ten days into evacuation, the PDCC projects an emergence of health related problems based on prior experiences and the current weather which is likely to contribute to the increasing risks for colds and other related diseases. Thus, the fear that zero casualty goal may be compromised by health risks and the willingness of the population-at-risk to stay in the evacuation centers

- PDCC Albay reported four (4) cases of conjunctivitis or sore eyes in Tabaco City