Written by Maria Leonila P. Bautista
PHIVOLCS-DOST conducted Rapid Earthquake Damage Assessment System (REDAS) trainings for three provinces as part of the third component of the READY Project. In this component, the REDAS software which was originally developed by PHIVOLCS for earthquake emergency response, is now being used as a tool to mainstream disaster risk reduction into the local development process under the READY Project.
At 9:12 A.M. today, Mayon Volcano manifested mild ash explosion that reached an approximate height of 200 m above the summit crater before drifting east-northeast. The ash-ejection was recorded as explosion-type earthquake which lasted for one minute by the seismic network deployed around the volcano.Immediately after the explosion, visual observation becomes hampered by the thick clouds.
Mayon Volcano's (13.2576°N, 123.6856°E) activity during the past 24 hours was dominated by 253 tremor episodes associated with lava chunks detaching from the summit crater and intermittent lava flow at the southeast flank of the volcano. No volcanic earthquake however, was recorded. The Sulfur Dioxide emission rate from the crater was maintained at 1,500 tonnes per day.
In the past 24 hours, there were some 6 volcanic earthquakes and 206 tremor episodes detected. The Sulfur Dioxide emission rate from the crater was estimated at about 1,500 tonnes per day with plume drifts varying from northeast to east-northeast. Ground deformation measurements indicated an overall deflation of the edifice.
These observations generally show an elevated state of unrest, although there is an apparent decline of activity since late August.
A total of two (2) volcanic earthquakes and 300 tremor episodes were detected in the past 24 hours. Measurements of Sulfur Dioxide emission rate decreased slightly to about 1,701 tonnes per day (t/d) yesterday from the previous 1,841 t/d. Steaming activity varied from moderate to voluminous with plume drifting north to northeast.
In summary, the continuing decline in key parameters such as seismic activity, Sulfur Dioxide emission rate and ground deformation may signify a slowdown in the volcano's activity.