A marked increase in seismic activity was manifested by Mayon Volcano (13.2500°N, 123.6833°E) during the past 24 hours. The seismic network detected thirty-eight (38) volcanic earthquakes. During cloud breaks from 6:01 A.M. - 9:20 A.M., 2:35 P.M. - 2:55 P.M. and 4:35 P.M. – 5:29 P.M. yesterday, steaming activity at the crater varied from weak to moderate with white steam clouds drifting towards southwest.  Fair crater glow (Intensity II - can be seen by the naked eye) was observed from 8:47 P.M. yesterday to 4:40 A.M. today. Results of ground deformation measurement (precise leveling) conducted last 07-11 May, 2011 showed slight inflation of the volcano’s edifice as compared with 06-10 March survey.

PHIVOLCS reiterates Alert Level 1 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.

DOST- PHIVOLCS