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Manila Bulletin devider Philippines devider National devider 'Repetitive pulse tremor' still ongoing at Mayon Volcano — Phivolcs

'Repetitive pulse tremor' still ongoing at Mayon Volcano — Phivolcs

Published Jul 5, 2023 03:04 am
The increase in Mayon’s volcanic activity continues, manifested by a “repetitive pulse tremor” that has been occurring since July 3, the Philippine Institute of Volcanology and Seismology (Phivolcs) said on Wednesday, July 5. Phivolcs said the pulse tremor that was detected at 3:47 p.m. on July 3 was still ongoing. “Since 3:47 p.m. (Philippine time) [on July 3], the Mayon Volcano Network began recording a continuous tremor-like series of weak volcanic earthquakes that steadied and increased in strength [in the morning of July 4] and persists to the present,” Phivolcs said in an advisory issued on Tuesday afternoon, July 4. “This resulted in an abrupt and sustained increase in the level of seismic energy release beginning July 3,” it added. Phivolcs said that the current activity in Mayon could be due to magmatic gas activity within the volcano’s edifice. Mayon’s activity was also dominated by five dome-collapse pyroclastic density currents (PDC) lasting two to two and a half minutes, 232 rockfall events, and one volcanic earthquake, between 5 a.m. on Tuesday, July 4 and 5 a.m. on Wednesday, July 5. A plume of smoke can be seen at the peak of Mayon Volcano from the six-kilometer permanent danger zone on June 15, 2023. (Ali Vicoy/Manila Bulletin)

Sustained lava effusion

 “In the past 24-hour period, a very slow effusion of lava from the summit crater of Mayon Volcano continued to feed lava flows and collapse debris on the Mi-isi and Bonga gullies,” it said. PDC and rockfall events were also observed in the Mi-isi, Bonga, and Basud gullies on the Mayon Volcano’s southern, southeastern, and eastern flanks, respectively. Lava flows from Mayon have advanced approximately 2.8 kilometers and 1.3 kilometers on the Mi-isi and Bonga gullies, respectively, while collapsed debris has reached a distance of 4 kilometers from the crater. A “moderate” amount of sulfur dioxide was also constantly emitted from the Mayon crater, producing a 200-meter-high steam-laden plume that drifted west-northwest and west-southwestward. Mayon has been exhibiting a low-rate effusive eruption of degassed lava for the past three weeks. According to Phivolcs, an effusive eruption is the outpouring of lava onto the ground, as opposed to explosive eruption, which is characterized by violent magma fragmentation.

Alert Level 3 stays

  Phivolcs said that there is still “high-level unrest” on Mayon Volcano. It is still on Alert Level 3 due to the presence of magma at the crater and the possibility of a “hazardous eruption within weeks or even days,” it added. 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.

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Mayon Volcano Alert Level 3 Phivolcs
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