The iconic Mayon Volcano has exhibited a notable geological event, as reported by the Philippine Institute of Volcanology and Seismology (PHIVOLCS). A phreatic eruption occurred at the volcano’s summit on Sunday at 4:37 p.m., marking a significant moment in the volcano’s recent activity. Initially, the eruption’s duration was reported as four minutes and 9 seconds, but PHIVOLCS later issued an erratum, stating the event lasted 169 seconds, as recorded seismically.
This phreatic eruption, a steam-driven explosion triggered when magma heats ground or surface water, led to several phenomena. Observers noted a loud booming sound, rockfall, and the creation of pyroclastic density currents (PDCs). Furthermore, the eruption produced a substantial ash plume, reaching up to 1,200 meters high and drifting southwest.
Despite these dramatic occurrences, the alert level for Mayon Volcano remains at Level 2. This type of eruption, characterized by the United States Geological Survey (USGS) as a steam-driven explosion, occurs when the intense heat from magma causes water to boil rapidly and convert into steam. This process can lead to an explosive mix of water, steam, rock, and ash. Such eruptions can also often be a precursor to or coincide with more conventional volcanic eruptions.
As of the latest reports, PHIVOLCS Director Teresito Bacolcolno indicated that ashfall had not been reported, a detail that might offer some relief amidst the potential hazards. Nonetheless, the eruption prompted the Civil Aviation Authority of the Philippines (CAAP) to issue a notice to airmen (NOTAM), cautioning pilots to steer clear of the volcano’s vicinity. This proactive measure ensures the safety of air traffic in light of the phreatic eruption and its implications.
As the situation continues to develop, authorities and local residents remain vigilant, closely monitoring Mayon Volcano’s activity and adhering to the guidelines and advisories issued by PHIVOLCS and other relevant agencies.