PHIVOLCS: Volcanic earthquakes main factor for alert levels

The occurrence of volcanic earthquakes is the principal parameter in raising or lowering alert levels over active volcanoes in the Philippines, according to PHIVOLCS.

Volcanic earthquakes, which indicate volcanic unrest due to rising magma beneath the Earth's surface, have prompted an Alert Level 4 warning for Taal Volcano.

These earthquakes are distinct from tectonic earthquakes and are induced by magma, according to PHIVOLCS.

Taal Volcano's unrest can only be declared as slowing down when earthquakes have diminished and this trend is continuing, according to PHIVOLCS Director Renato Solidum.

Alert Level 4 signifies a possible hazardous eruption within hours to days, and thousands of residents have been evacuated amid potential base surges and volcanic tsunamis.

More than three thousand earthquakes have been recorded since Taal Volcano's unrest began, with 466 plotted and 156 reportedly felt.

PHIVOLCS states that the intense seismic activity probably signifies continuous magmatic intrusion beneath the Taal edifice, which may lead to further eruptive activity.