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Phivolcs information 475 volcanic earthquakes at Bulusan Volcano since March 15, indicating a return to ‘low-level unrest’
MANILA, Philippines – The alert degree of Sorsogon province’s Bulusan Volcano was raised from 0 to 1 on Sunday, March 22, because the volcano “entered a interval of low-level unrest” and possibilities of phreatic or steam-driven eruptions elevated.
The Philippine Institute of Volcanology and Seismology (Phivolcs) mentioned in a bulletin on Sunday that it has recorded 475 volcanic earthquakes at Bulusan since March 15.
“Most of those had been weak volcano-tectonic earthquakes which can be related to rock fracturing at shallow depths beneath the volcano edifice,” Phivolcs mentioned.
Swarms of volcanic earthquakes had preceded Bulusan’s phreatic eruptions in June 2022 and April 2025.
State volcanologists added that Bulusan’s western and southeastern flanks have been inflated or swollen for the reason that final week of January and the primary week of March, respectively.
“Total, these parameters may point out that shallow hydrothermal processes beneath the volcano are underway that might result in steam-driven or phreatic eruptions at any of its summit vents,” Phivolcs mentioned.
As a result of threat of phreatic eruptions occurring, Phivolcs reminded native authorities models and the general public to not enter the 4-kilometer-radius everlasting hazard zone surrounding Bulusan. Potential volcanic hazards embrace “pyroclastic density currents, ballistic projectiles, rockfall, avalanches, and ashfall.”
Previous to Sunday, Bulusan had been beneath Alert Degree 0 since February 6. The alert ranges vary from 0 (regular) to five (hazardous eruption in progress).
Except for Bulusan, Batangas province’s Taal Volcano can also be presently beneath Alert Degree 1, which it has maintained since July 11, 2022. Albay province’s Mayon Volcano was raised to Alert Degree 3 simply final January 6, whereas Negros Island’s Kanlaon Volcano was downgraded to Alert Degree 2 on July 29, 2025. – Rappler.com
