MAYON VOLCANO BULLETIN 04 April 2011 8:00 A.M. Print
Tuesday, 05 April 2011 08:09

Mayon Volcano’s (13.2576°N, 123.6856°E) seismic network recorded one (1) volcanic earthquake and two (2) rock fall related events during the past 24 hours. Steaming activity from the crater varied from wispy to weak with white steam clouds that drifted west-south-west. Crater glow was not observed last night due to clouds obscuring the summit. Measurements of the sulphur dioxide (SO2) emission rate yesterday yielded an average value of 652 tonnes/day.  A precise levelling ground deformation 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.