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OPEN-FILE REPORT

Philippine Institute of Volcanology and Seismology, Powered by Joomla!
MAYON VOLCANO BULLETIN, 11 April 2012, 8:00 A.M. PDF Print

Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network detected two (2) volcanic earthquakes during the past 24-hour observation period. Weak emission of white steam plumes that crept toward northwest was observed. Crater was visible last night but no glow could be observed. Measurement of sulfur dioxide (SO2) emission rate on 25 March 2012 yielded an average of 203 tonnes per day. Ground deformation survey (precise leveling) conducted last 1–5 February 2012 showed no significant change compared with the November 2011 survey.

Mayon Volcano’s alert status remains at Alert Level 1.  Although this means that no eruption is imminent, it is strongly advised that the public refrain from entering the 6-kilometer radius Permanent Danger Zone (PDZ) due to the threat of sudden steam-driven eruptions and rockfalls from the upper and middle slopes of the volcano. Active stream/river channels and those identified as perenially lahar prone areas on all sectors of the volcano should also be avoided especially during bad weather condition or when there is heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Mayon Volcano’s activity and any new development will be relayed to all concerned.