In an advisory, Phivolcs said the volcano recorded a phreatomagmatic eruption at 3:16 p.m.
“Taal Volcano Main Crater generated a short-lived dark phreatomagmatic plume 1 kilometer-high with no accompanying volcanic earthquake,” the bureau said.
Alert Level 3 means there is magmatic intrusion at the main crater that may further drive succeeding eruptions, according to Phivolcs.
The agency also reminded the public that the Taal Volcano island is a Permanent Danger Zone, and that entry into the vicinity as well as the “high-risk” barangays of Agoncillo and Laurel in Batangas is prohibited.
The institute has a 5-step alert level for Taal, with Alert Level 5 being the highest and indicating that hazardous eruption is in progress.
Phivolcs reminded the public that Taal Volcano Island is a permanent danger zone and entry is prohibited.
It also advised communities around Taal Lake "to take precautionary measures and be vigilant of possible lakewater disturbances related to the ongoing unrest."