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Over 60 volcanic earthquakes were recorded at Bulusan Volcano in the past 24 hours, as increased seismicity persists and the possibility of a phreatic eruption remains.
In its 8 a.m. bulletin issued on Tuesday, June 14, the Philippine Institute of Volcanology and Seismology (Phivolcs) said that of the 69 volcanic earthquakes, 56 were tremor events that lasted 19 minutes.
It has also detected a 750-meter-high “voluminous” emission from the volcano, while the volcano’s edifice remained inflated.
Moreover, Bulusan Volcano’s sulfur dioxide or SO2 emission averaged 4,627 tons per day on June 12.
Phivolcs said the active volcano remains under Alert Level 1, which means it is still in a state of hydrothermal unrest.
Bulusan Volcano’s status has been raised from Level 0 to Level 1, following a phreatic eruption on June 5. It had another phreatic eruption on June 12.
Phivolcs reminded the public that entry into the four-kilometer permanent danger zone is strictly prohibited because of possible sudden steam-driven or phreatic eruptions.
Meanwhile, the public is advised to remain vigilant when entering the two-kilometer extended danger zone, which is in the southeast sector of Bulusan Volcano.
Furthermore, people living within valleys and along river/stream channels especially on the southeast, southwest and northwest sector of the edifice were advised to be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall should another phreatic eruption occurs.
Bulusan Volcano also had phreatic eruptions on June 5 and 12.