The telemetered seismic network around
Mayon Volcano detected nine (9) low frequency and two (2) high frequency
volcanic earthquakes and 14 high frequency short duration tremors during
the past 24 hours. Ground deformation measurements using Electronic Distance
Meter (EDM) at the northwest slope of the volcano showed that the volcano
is deflated. The sulfur dioxide (SO2) emission rate increased from 900
tonnes/day (t/d) to 4,400 t/d. During cloud breaks, moderate white steam
was observed and drifted towards the northwest.
The volcano is expected to produce a
sporadic number of earthquakes and fluctuating volume of Sulfur Dioxide
because the volcanic system is still readjusting. However, because no accelerating
or increasing trend is indicated by these parameters, PHIVOLCS considers
these observation as part of a return to repose conditions. The presence
of still-hot magma near the summit causes the crater to glow at night.
PHIVOLCS reiterates to residents living on or near river channels that in case of prolonged and intense rainfall in the volcano area, loose pyroclastic materials deposited along the slopes and river channels are susceptible to erosion and can be remobilized as lahars towards the lower slopes. The areas in which potentially destructive lahars may occur are lowlands fronting the Mabinit and Boyuan-Padang river channels in Legazpi City; Miisi in Daraga; Tumpa, Anoling and Quirangay channels in Camalig; Maninila channel in Guinobatan; Basud-Lidong channel in Sto. Domingo; Bulawan channel in Malilipot; San Vicente and Buang channels in Tabaco and Upper Nasisi and Upper Nabonton in Ligao.
In view of the above, Alert Level 3 remains over Mayon Volcano. This means that there is less probability of hazardous explosive eruption. However, the public is still reminded that sudden small explosions may occur due to localized pockets of gas within the magmatic system. The effects of these explosions are expected to be contained within the 6-km radius Permanent Danger Zone around the volcano and within the 7-km radius Extended Danger Zone in the southeast quadrant. The danger zones should be off-limits at all times. ( from Phivolcs)