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Phivolcs: 57 quakes, 4 ashing events observed in Mayon over past 24 hours
Phivolcs: 57 quakes, 4 ashing events observed in Mayon over past 24 hours
Phivolcs: 57 quakes, 4 ashing events observed in Mayon over past 24 hours
by Ellicia Del Mundo02 August 2023
Photo courtesy: Phivolcs Facebook page

The state seismologist PHIVOLCS reported on Wednesday that it has observed 57 volcanic earthquakes including four ashing events and 225 rockfall events in Mayon Volcano in the past 24 hours.

The total number of volcanic earthquakes slightly went down, from 258 recorded on Monday to 57. But the measure of rockfalls doubled, from 100 to 225.

According to Phivolcs' 8 AM bulletin, Mayon Volcano also produced five Pyroclastic Density Current (PDC) events and 2,709 tonnes of sulfur dioxide.

The slow effusion of lava from the summit crater persists, with lava maintaining its lengths of 3.4 kilometers along southeastern Bonga, 2.8 km along south Mi-si, and 600 km along eastern Basud.


The state seismologist noted that their short-term observation has shown that the eastern lower flanks of Mayon are deflated since early July 2023 while its northwest middle flanks are inflated since the third week of July 2023.

"Longer-term ground deformation parameters from EDM, precise leveling, continuous GPS, and electronic tilt monitoring indicate that Mayon is still generally inflated relative to baseline levels," Phivolcs added.

Alert Level 3 still prevailed over Mayon Volcano as it continue to exhibit a relatively high level of unrest and a hazardous eruption may occur within the next weeks or even days.

The state seismologist advised residents living within the six-kilometer radius Permanent Danger Zone (PDZ) to remain in evacuation centers as PDCs, lava flows, rockfalls, and other volcanic hazards may endanger their lives and homes.


"Increased vigilance against pyroclastic density currents, lahars, and sediment-laden streamflows along channels draining the edifice is also advised. Heavy rainfall could generate channel-confined lahars and sediment-laden streamflows in channels where PDC deposits were emplaced," Phivolcs said.

Aircraft are still prohibited from flying near the Mayon's summit due to the imminent danger.

"Based on the current prevailing wind pattern, ash fall events may most likely occur on the south side of the volcano," the state seismologist furthered.

Mayon Volcano has been placed under Alert Level No. 3 since June 8.


As of August 2, the Mayon Volcano's restiveness has affected 9,876 families or equivalent to 38,396 individuals in eight Cities or Municipalities.

Of this total, 18,788 individuals are still taking temporary in 27 evacuation centers.

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