THE Philippine Institute of Volcanology and Seismology (Phivolcs) yesterday warned of more hazardous eruption as it advised residents near the lakeshores of Taal Volcano to consider evacuation as a must while the government is bracing for activities that calls for Alert Level 5.
According to Phivolcs, a volcanic tsunami is possible under alert level 5 thus the need for lakeshore residents to leave their homes for security and safety.
Phivolcs said that a volcanic tsunami may occur in caldera lakes when water is displaced by deformation of the lake floor caused by rising magma.
As of yesterday morning, Alert Level 4 remained in effect over Taal Volcano, meaning hazardous explosive eruption is possible within hours to days.
Phivolcs strongly reiterated a total evacuation in the Taal Island and areas it identified as high risks to pyroclastic density currents and volcanic tsunami within the 14-kilometer radius from the Taal main crater.
As of 8 a.m. yesterday, Phivolcs said that Taal Volcano entered a period of intense unrest which started with phreatic or steam-driven activity in several points inside the main crater.
From that point of activity, it progressed into magmatic eruption around 2 p.m. which is characterized by weak lava functioning accompanied by thunder and flashes of lighting.
In its advisory, Phivolcs said that it recorded a total of 75 volcanic earthquakes in Taal region as of 5:00 a.m. yesterday while 32 of these tremors were felt with intensities ranging from II - V in Tagaytay City, Cabuyao, Laguna, Talisay, Alitagtag, Lemery and Bauan, Batangas. Such intense seismic activity probably signifies continuous magmatic intrusion beneath the Taal edifice, which may lead to further eruptive activity.