MANILA - Mt. Bulusan in Sorsogon, Bicol had a phreatic eruption Monday, launching a plume of ash about one kilometer high.
Philippine Institute of Volcanology (Phivolcs) scientist Ed Laguerta said the phreatic or steam-driven eruption was observed at 7:36 a.m.
Phivolcs is still determining if the volcanic activity affected any nearby community, Laguerta said.
Alert Level 1, indicating abnormal activity, remains over Bulusan Volcano, Phivolcs said in an 8 a.m. notice on Sunday.
This indicates that hydrothermal processes are underway beneath the volcano, which may lead to more steam-driven eruptions, the agency said.
It also reminded the public not to enter the 4-kilometer radius Permanent Danger Zone (PDZ).
Phivolcs also warned people living within valleys and along river or stream channels southwest and northwest of the volcano to guard against sediment-laden stream flows and lahar in the event of heavy and prolonged rainfall.
Pilots have also been asked to steer clear of the volcano’s summit to avoid ash from any sudden explosions.
Phivolcs said it will continue to monitor volcanic activity.
-- With reports from Jose Carretero, ABS-CBN News