|MAYON VOLCANO BULLETIN, 20 April 2011, 8:00 A.M.|
|Wednesday, 20 April 2011 06:36|
No volcanic earthquake was recorded by Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network during the past 24 hours. Emission of weak white steam was observed drifting towards southwest. Crater glow was observed at intensity II last night. Measurements of sulphur dioxide (SO2) emission rate yesterday yielded a value of 198.0 tonnes per day. Results of precise leveling survey conducted last 06-10 March 2011 showed slight deflation of volcano edifice as compared with 05-10 January 2010 baseline survey.
Alert Level 1 is in effect over Mayon Volcano. Although this means that no eruption is imminent, it is recommended that the public should not enter the 6-kilometer radius Permanent Danger Zone (PDZ) due to the continuing threat from sudden small explosions and rockfalls from the upper and middle slopes of the volcano. Active stream/river channels and those perennially identified as lahar prone areas in the southern sector should also be avoided especially during bad weather conditions 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.