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Manila Bulletin devider Philippines devider National devider Mayon unrest continues: Sustained pyroclastic density currents, rockfalls, volcanic tremors in past 24 hours

Mayon unrest continues: Sustained pyroclastic density currents, rockfalls, volcanic tremors in past 24 hours

Published Jul 6, 2023 03:28 am
The Philippine Institute of Volcanology and Seismology (Phivolcs) on Thursday, July 6 continued to observe pyroclastic density currents, rockfalls, and volcanic tremors from Mayon Volcano’s effusive eruption. Phivolcs recorded seven pyroclastic density currents (PDC) caused by a lava dome collapse lasting one to four minutes, and two PDC events caused by a lava front collapse producing a 300-meter-high light brown plume between 5 a.m. on Wednesday, July 5, and 5 a.m. on Thursday, July 6. It also recorded 243 rockfall occurrences and an ongoing "repetitive pulse tremor" that began around 3:47 p.m. on July 3. Phivolcs noted that the “very slow” effusion of lava from Mayon Volcano has continued to feed lava flows and collapse debris on the Mi-isi and Bonga gullies. There were also sustained rockfall and PDC events on the Mi-isi, Bonga, and Basud gullies on the southern, southeastern, and eastern flanks of the volcano, respectively. Lava flows have progressed along the Mi-isi and Bonga gullies by about 2,800 meters and 1,300 meters, respectively, while collapsed debris has reached a distance of 4,000 meters from the crater. Phivolcs also pointed out that the Mayon Volcano continues to emit a “moderate” amount of sulfur dioxide, producing a 500-meter-high steam-laden plume that drifted west-southwest and west-northwest.
This image from the Mayon Volcano Observatory captures the volcano's "intense glare, active degassing, and effusion" from its summit crater on June 29, 2023. (Phivolcs)

Hazardous volcano eruption still possible

 According to Phivolcs, Mayon Volcano’s current activity still shows an “increased tendency toward hazardous eruption,” and as such, Alert Level 3 is maintained. There is still the possibility of a “hazardous eruption within weeks or even days” because of the presence of magma at the crater, Phivolcs said. Due to increasing unrest, the Mayon Volcano’s status has been upgraded twice in the past month, first to level 2 on June 5 and then to level 3 on June 8. Phivolcs strongly advised the evacuation within the six-kilometer permanent danger zone due to PDCs, lava, rockfalls, and other volcanic hazards. In addition, Phivolcs advised communities to maintain increased vigilance against PDCs, lahars and sediment-laden stream flows along channels draining the volcano edifice, as heavy rainfall could cause channel-confined lahars and sediment-laden stream flows. Pilots were also asked to avoid flying close to the volcano because ash from a sudden eruption may pose hazards to aircraft. According to Phivolcs, communities on the southern side of Mayon Volcano may most likely experience ash fall events based on the current wind pattern.

Related Tags

Mayon Volcano Alert Level 3 Phivolcs
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