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Mayon Volcano Update 24 December 2009

Posted by feww on December 24, 2009

Mayon lava fountains shoot up to 500m

Mt Mayon’s Unrest Continues at High Levels of Intensity

Mayon Volcano in Legazpi city shoots up a column of ash into air during a small explosion December 24, 2009. The Philippines’ most active volcano could erupt explosively anytime. (Xinhua/Reuters Photo). Image may be subject to copyright.

State Vulcanologists record 815 volcanic earthquakes and harmonic tremors, many at maximum deflection.

    • Mayon lava fountains shoot up to 500m.
    • Mt Mayon unrest continues at high levels of intensity.
    • Incandescent lava fragments were ejected during several explosions which occurred last night.
    • 20 Ash explosions, observed when visibility was good, ejected columns of “grayish to light brown” ash up to 1500 meters into air.
    • Sulfur Dioxide (SO2) emissions  remained high at an average daily rate of about 5,737 metric tons, yesterday.
    • 124 booming and rumbling sounds were heard throughout the past 24 hours.

    The following Bulletin by Phivolcs was released today:

    Mayon Volcano Bulletin 11  released on 24 December 2009

    Mayon Volcano’s (13.2576 N, 123.6856 E) intense level of unrest continued to persist during the past observation period.  Seismic activity remained elevated in number and size as the seismic network detected 815 volcanic earthquakes and harmonic tremors. Many of these volcanic earthquakes were recorded at maximum deflection. Twenty (20) ash explosions were observed during times of good visibility. These explosions produced grayish to light brown ash columns that reached height from 100 to 1500 meters above the summit before drifting towards the southwest by the prevailing northeast monsoon. Lava fountaining was observed at 2312 PM, 2314 PM, 2320 PM and 2332 PM with maximum height of 500 meters above the crater. Several explosions with ejected incandescent lava fragments were noted during night observations.

    Sulfur Dioxide (SO2) emission rate remained high and was measured at an average of 5,737 tons per day (t/d) yesterday. One hundred twenty four (124) audible booming and rumbling sounds were intermittently heard for the past 24 hours.  Red hot lava also continuously flowed down along the Bonga-Buyuan, Miisi and Lidong gullies.

    Alert Level 4 remains hoisted over Mayon Volcano, meaning a hazardous eruption is possible within days.  Thus, 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 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.  PHIVOLCS–DOST is closely monitoring Mayon Volcano’s activity and any new significant development will be immediately posted to all concerned.

    For previous entries, additional information and links to Mayon Volcano see:

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