|MAYON VOLCANO BULLETIN 20 November 2012 8:00 A.M.|
|Tuesday, 20 November 2012 06:42|
Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network did not detect any volcanic earthquake during the past 24-hour observation period. Moderate emission of white steam plumes creeping downslope and drifting northwest was observed. Crater glow could not be observed due to thick clouds covering the summit area. Sulfur dioxide (SO2) emission rate on 01 November 2012 was measured at an average of 153 tonnes per day. Results of a ground deformation survey (precise levelling) conducted last 14 -18 November 2012 showed no significant changes compared to the August 2012 survey, although the volcano is still slightly inflated based on the January 2010 baseline survey. GPS and Tilt data from January to October this year indicate a slight inflation and deflation of the edifice at the lower and upper slopes, respectively.
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 perennially 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.