In a press conference, the agency further explained that fissuring on the caldera region means that the top of the volcano has been depressurized and the high volume of magma continues to rise, which will result in an explosive eruption.
“Ito pong fissures na ito or fractures, ito po ay nangyari din nung 1911 na pagputok ng bulkan bago po nagprogress sa climactic o explosive eruption,” said Ma. Antonia Bornas, chief of Volcano Monitoring and Eruption Prediction Division.
(These fissures, the same happened in the 1911 eruption of the volcano before it progressed into a climactic or explosive eruption.)
Phivolcs also noted that another indication of an impending explosive eruption is the intense seismic activity or the 335 volcanic earthquakes recorded since Taal’s phreatic eruption on Sunday afternoon until 10 a.m. Tuesday.
According to Phivolcs, they have recorded earthquakes as strong as 4.1-magnitude since January 12. It said such a degree of tremor from inside the earth is considered powerful for a volcanic earthquake.