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Almost 200 microearthquakes recorded in Mt. Kanlaon.

By Ellalyn De Vera-Ruiz

Mt. Kanlaon in Negros Island continues to exhibit unrest as almost 200 volcanic earthquakes were recorded in a span of 24 hours.

From 8 a.m. Wednesday to 8 a.m. Thursday, the Philippine Institute of Volcanology and Seismology (Phivolcs) recorded 197 volcanic earthquakes, 195 of which are microearthquakes, while 14 tremors lasted about two to 30 minutes.

Where the crater was visible, Phivolcs also observed moderate emission of white steam-laden plumes drifting to the west.

A continuous GPS data monitoring showed a slight inflation of the volcano's edifice, which has been visible since December 2015, it added.

Sulfur dioxide emission was measured at an average of 640 tons/day on January 3. Its emission tends to increase through time as magma degasses with increasing rates as it moves up from great depths beneath the volcano, Phivolcs explained.

Phivolcs said the Mt. Kanlaon's alert level 2 status prevails.

It warned that there is a probable intrusion of magma at depth which may or may not lead to a magmatic eruption.

It reminded the concerned local government units and the public of the strict entry into the four-kilometer radius permanent danger zone (PDZ).

The entry into the PDZ is strictly prohibited due to the further possibilities of sudden and hazardous steam-driven or phreatic eruptions, Phivolcs said.

Likewise, civil aviation authorities were asked to advise pilots to avoid flying close to the volcano's summit as ejecta from any sudden phreatic eruption can be hazardous to aircraft.

According to Phivolcs, Mt. Kanlaon had 30 eruptions in history. A steam-driven or low-energy phreatic eruption last occurred on December 9, 2017.



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Title Annotation:Visayas
Publication:Manila Bulletin
Date:Jan 4, 2018
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