No entry in Kanlaon's permanent danger zone after alert level rises

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Metro Manila (CNN Philippines, November 15) — Entry within the four kilometers from the summit of Mount Kanlaon, or its permanent danger zone (PDZ), is now prohibited after the Philippine Institute for Volcanology and Seismology (PHIVOLCS) raised its alert level of unrest from "low" to "moderate."

Alert level 2 of a five-step alert system  for Kanlaon was raised after PHIVOLCS recorded 279 volcanic earthquakes for the past 24 hours. Mount Kanlaon, whose peak is at 2,435 kilometers above sea level, is in between Negros Occidental and Negros Oriental.

"There is probable intrusion of magma at depth which may or may not lead to a magmatic eruption," PHIVOLCS said in a bulletin released on Wednesday. Magma is the hot, molten rock found below the surface of the earth.

 

Flying close to the volcano's summit must also be avoided as "ejecta" or the matter thrown from the crater of a volcano can be hazardous to aircraft, PHIVOLCS added. The PHIVOLCS Kanlaon Observatory is located in La Carlota City, Negros Occidental.

The disturbance does not manifest yet on the surface of the volcano, PHIVOLCS Volcano Monitoring and Eruption Prediction Division Chief Mariton Bornas. She was referring to the effects of the earthquakes or any visible signs such as steam rising from the volcano.

Kanlaon was placed on "low level of unrest" or Alert Level 1 on August 18, after the number of volcanic earthquakes detected per day continued to increase.

PHIVOLCS said factors which may trigger the rise of the alert level from 1 to 2 in Kanlaon are increase in volcanic earthquake, rise in temperature, acidity, and gas concentrations, as well as steam and ash explosions from the summit crater or new vents.

Kanlaon last erupted on June 18, 2016, when it spewed ash around 1,312 ft (400 m) to the sky. Ashfall was experienced in barangays San Miguel, Gintubdan and Araal in La Carlota, Negros Occidental.

READ: Kanlaon Volcano in Negros erupts