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Mayon Volcano Bulletin
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Mayon continued to generate frequent rockfalls and lava extrusion for the
past 24 hours. Seismic activity was dominated by one hundred short duration
harmonic tremors which were correlated with intrusion of magma into the
summit and detaching lava fragments. At night, the falling detached lava
blocks disintegrated upon impact and give an impression of incandescent
streak of lava on the upper slope. The advancing lava flow has now reached
1000 meters downslope of the summit crater while fragments of the rolling
incandescent boulders were observed approximately 3000 meters at elevation
700 meters above sea level in Bonga gully.
Moderate volume of white steam was observed from the volcano’s crater from
6:32 AM to 8:22 AM and 3:35 PM to 6:14 PM yesterday.
The overall assessment of Mayon Volcano remains at Alert Level 3. This means
that lava extrusion may shift to explosive eruption which could generate
pyroclastic flows within weeks should there be a rapid rate of supply of
magma. Residents just beyond the Permanent Danger Zone, especially in the
southeast portion facing the Bonga Gully, should be vigilant against
explosive eruption since major hazards like pyroclastic flows, rockfalls,
lava flow and small rock avalanches all occur within these areas and ready
to evacuate their premises at first notice or when life-threatening volcanic
flows start to descend from the volcano’s summit.
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