Bulusan Volcano in Sorsogon continued to show signs of “low-level unrest,” as state volcanologists recorded 106 volcanic earthquakes in the past 24 hours.

In its 8 a.m. bulletin issued on Monday, June 13, the Philippine Institute of Volcanology and Seismology (Phivolcs) said that of the 106 volcanic earthquakes, 48 were tremor events that lasted 20 minutes.

It has also detected a 500-meter-high “voluminous” emission from the volcano.

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 there is a “slight increase” in volcanic earthquake and steam or gas activity.

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.