The Philippine Institute of Volcanology and Seismology (Philvolcs) reported a small phreatic eruption lasting two minutes in Taal Volcano, Batangas last Wednesday.
A voluminous emission of plumes of up to 3,000 meters tall that drifted to north northwest directions was observed, Philvolcs said.
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The volcano emitted 2,256 tons of sulfur dioxide gas on Wednesday.
Phivolcs said there was an upwelling of hot volcanic fluids in its main crater lake.
Taal Volcano is still under Alert Level 1.
Phivolcs said sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall and lethal accumulations or expulsions of volcanic gas may be possible under Alert Level 1.