Taal calm but Bulusan acts up with 11 quakes in last 24 hrs

04/28/2011 | 09:15 AM

While Taal Volcano calmed down, it was Bulusan’s turn to act up, with state volcanologists recording at least 11 volcanic quakes there in the last 24 hours.

But the Philippine Institute of Volcanology and Seismology said the alert levels at the two volcanos remained at “2” and “1” respectively as of Thursday.

“The seismic network around Bulusan Volcano (in Sorsogon) recorded 11 volcanic earthquakes during the past 24 hours. Weak steaming were occasionally observed at the northwest thermal vents. The summit crater and other thermal vents were cloud-covered during the past observation period,” Phivolcs said in its Thursday update.

However, it said no other significant volcanic activity was observed since the ash explosion there last Feb. 21. No lahar event was reported or observed, it added.

Phivolcs said Bulusan’s status remains at Alert Level 1, meaning the source of activity is hydrothermal and shallow.

Also, Phivolcs reminded civil aviation authorities to warn pilots to avoid flying close to the volcano’s summit as ejected ash and volcanic fragments from sudden explosions may be hazardous to aircraft.

Phivolcs also reminded people living near valleys and river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall.

7 quakes at Taal

Phivolcs said Taal was relatively calm in the last 24 hours, with its seismic network recording seven volcanic earthquakes during the past 24 hours.

Water temperature at the main crater lake increased from 30.1 to 31.8 degrees Celsius, it added.

But Phivolcs said Alert Level 2 remains over Taal Volcano with the interpretation that magma has been intruding towards the surface.

It reminded the public that the Main Crater, Daang Kastila Trail and Mt. Tabaro are strictly off-limits because sudden hazardous steam-driven explosions may occur and high concentrations of toxic gases may accumulate.

Phivolcs said breathing air with high concentration of gases can be lethal to humans, animals and even cause damage to vegetation.

Also, it said the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strictly not recommended.

2 quakes, 1 rockfall at Mayon

In Albay, Phivolcs said at least two volcanic quakes and one rockfall event were recorded during the past 24 hours.

Phivolcs also noted weak steaming and white steam clouds drifting northwest, and a fair crater glow.

Phivolcs said Alert Level 1 remains over Mayon Volcano. — RSJ, GMA News

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