Bulusan Volcano in Sorsogon, Philippines, has recently exhibited increased seismic activity, capturing the attention of both locals and the Philippine Institute of Volcanology and Seismology (PHIVOLCS). Early in the morning, PHIVOLCS recorded 71 volcanic-tectonic earthquakes, indicators of rock fracturing within the volcano. These earthquakes, ranging in magnitude from 0.3 to 2.2, were centered around one to six kilometers beneath the volcano’s southern flank.
Observations also revealed weak to moderate plumes emanating from the volcano’s summit crater and active vents, a sign of ongoing degassing activity. Despite these developments, the alert level remains at 1, indicating a low level of unrest but increased possibility of steam-driven or phreatic eruptions.
PHIVOLCS has issued warnings against entering the four-kilometer radius permanent danger zone surrounding the volcano. Additionally, there’s an advisory for increased vigilance within the two-kilometer extended danger zone on the southeast sector. These precautions are in place due to the potential risks of sudden and hazardous phreatic eruptions.
The agency also cautions against flying close to the volcano’s summit, as ash from any sudden eruption could pose serious risks to aircraft. Moreover, residents living in valleys and along river or stream channels are advised to be on alert for sediment-laden stream flows and lahars, especially during heavy and prolonged rainfall, which could be triggered by phreatic eruptions.
This heightened activity at Bulusan Volcano serves as a reminder of the dynamic and unpredictable nature of volcanic systems, underscoring the importance of continuous monitoring and preparedness in the face of natural hazards.