Ground deformation on Kanlaon increases

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BACOLOD CITY, Philippines — State volcanologists have noted an increase in the ground deformation on Kanlaon Volcano in Negros.

The Philippine Institute of Volcanology and Seismology (Phivolcs) said the swelling on the edifice of the volcano was first discovered on June 18.

The swelling remained and increased within almost a month.

Pronounced deformation was noted in the middle and lower southeastern slopes, state volcanologists said.

Phivolcs resident volcanologist Ptolemy Mañego said six tectonic earthquakes were recorded around Kanlaon yesterday.

Citing persistent volcanic earthquakes and elevated sulfur dioxide emissions, Phivolcs said the change in the size of the ground deformation indicated that magmatic intrusion has been taking place beneath the edifice.

Phivolcs said these parameters could increase chances of an eruption.

As this developed, almost all of the 9,000 families displaced by the volcano’s phreatic eruption on June 3 have returned home, according to the local office of the Department of Social Welfare and Development.

Only 10 families composed of 34 people remain in two evacuation centers.

Another family is staying with relatives in La Castellana, Negros Occidental.

Eleven families who used to reside within the four-kilometer-radius permanent danger zone of Kanlaon were not allowed to return home by the municipal government of La Castellana.

The municipal government said the danger zone should remain unoccupied.

Mañego said Alert Level 2 remains in effect over Kanlaon, which means current unrest, driven by shallow magmatic processes, is ongoing and can lead to eruptions.

Communities near river systems located on the volcano’s southern and western slopes, especially those that experienced lahar and mud flows, have been told to stay alert during heavy rains.

In case of ash fall events, people were advised to cover their noses and mouths with a damp, clean cloth or dust mask.

Phivolcs gave assurance that close monitoring of Kanlaon Volcano would continue and any development would be immediately communicated to all stakeholders. — Bella Cariaso

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