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19 quakes rock Bulusan; alert level remains at ‘1’


At least 19 volcanic quakes were recorded around restive Bulusan Volcano in Sorsogon province in the last 24 hours, state volcanologists said Wednesday.

The Philippine Institute of Volcanology and Seismology (Phivolcs) said Bulusan, which ejected ash shortly before midnight Monday, also emitted white steam Tuesday.

“Bulusan Volcano’s seismic network detected 19 volcanic earthquakes during the past 24-hour observation period. During times of good visibility, weak emission of white steam was observed rising from the volcano’s northwest vent while no steaming was observed from the crater and southeast vent,” it said in its update as of 8 a.m. Wednesday, Nov. 17, 2010.

It added that Tuesday’s measurement of sulfur dioxide emission rate yielded an average value of 44 tonnes per day.

But Phivolcs said that despite the relative calm, Bulusan’s alert level remains at “1.”

Also, it reminded the public not to enter the 4-km permanent danger zone “because it may be affected by sudden steam explosions.”

“People residing near valleys and streams are also advised to be vigilant against sediment-laden stream flows in the event of heavy and continuous rainfall. Due to the prevailing wind direction, residents located in the northwest and southwest sectors of the volcano are advised to take precautions against ashfalls,” it said.

It added civil aviation authorities must advise pilots to avoid flying close to the volcano’s summit as ejected ash and volcanic fragments from sudden explosions may pose hazards to aircraft. — RSJ, GMANews.TV

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