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Manila Bulletin devider Philippines devider National devider Mayon continues 'very slow' lava effusion; produces more rockfalls, pyroclastic flows — Phivolcs

Mayon continues 'very slow' lava effusion; produces more rockfalls, pyroclastic flows — Phivolcs

Published Jun 16, 2023 01:54 am
The Philippine Institute of Volcanology and Seismology (Phivolcs) said that “very slow” lava effusion from the summit crater of Mayon Volcano continued for the fifth night on Thursday, June 15, resulting in increased events of rockfall and pyroclastic density current (PDC). In a bulletin issued at 8 a.m. on Friday, June 16, Phivolcs said the lava effusion continued to feed lava flows and collapse debris on the Mi-isi and Bonga gullies on the south and southeastern sides, respectively. “The lava flows have advanced to approximately one kilometer from the summit crater while collapse debris have deposited to two kilometers from the crater,” it pointed out. The Philippine Institute of Volcanology and Seismology (Phivolcs) said a very slow lava effusion from Mayon Volcano’s summit crater continued for the fifth night on June 15, 2023, resulting in more rockfall events and pyroclastic density currents. (ALI VICOY/MANILA BULLETIN)

Rockfalls, volcanic quakes, pyroclastic flows

 Phivolcs noted that 307 rockfall events, four volcanic earthquakes, and 13 dome-collapse PDCs were recorded over the past 24 hours. “PDCs lasted two to six minutes and were emplaced on the Mi-isi and Bonga Gullies within one kilometer of the crater,” it said. “The largest PDC event since June 8 occurred at 11:18 p.m. on June 15 and deposited material within the upper one kilometer of these gullies,” it added. Phivolcs said traces of ashfall dispersed from the PDCs were observed at Sitio Buga, Brgy. Nabonton in Ligao City and Purok 7, Brgy. San Francisco in Guinobatan town. “Continuous moderate degassing from the summit crater produced steam-laden plumes that rose 750 m before drifting to the general west and north-northeast,” it added. Sulfur dioxideemission averaged 826 tons per day when it was last measured on June 15.

‘High-level’ unrest

 Mayon Volcano is "currently in a relatively high-level of unrest," according to Phivolcs, implying that magma is creeping upward. It has been on alert level 3 since June 8, indicating that a “hazardous eruption is possible within weeks or even days.” The evacuation of residents within the six-kilometer permanent danger zone has been recommended due to the risk of PDCs, lava flows, rockfalls, and other volcanic hazards. Phivolcs warned the public to be cautious of PDCs, lahars, and sediment-laden stream flows along channels draining the volcano edifice. It pointed out that heavy rainfall could cause channel-confined lahars and sediment-laden stream flows on channels where PDC deposits were emplaced. Likewise, it said that ash fall events may “most likely” occur on the south side of the volcano, based on the current prevailing wind pattern.

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Mayon Volcano Alert Level 3 Phivolcs
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