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Philippine Institute of Volcanology and Seismology, Powered by Joomla!
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BULUSAN VOLCANO BULLETIN, 17 May 2011, 8:00 A.M.
Monday, 16 May 2011 23:24

The seismic network at Bulusan Volcano (12.7667°N, 124.0500°E) detected a total of one hundred forty four (144) volcanic earthquakes for the past 24 hours. Steaming activity at the active vents was weak to moderate throughout the observation period. Results of ground deformation survey (precise leveling) conducted last 07-11 May 2011 showed no significant change as compared with 01-05 March 2011 survey.  

Bulusan Volcano is generally known for its sudden steam- driven or phreatic explosions. Similar events are most likely to occur in view of the volcano’s reactivation last 13 May 2011 especially with the current increase in the volcano’s seismicity. Bulusan Volcano’s status remains hoisted at Alert Level 1, meaning sudden steam and ash explosions can occur.  

Entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited, since the area is at risk to sudden steam and ash explosions.  Due to the prevailing wind direction, residents in the northwest and southwest sectors of the volcano are reminded to take precautions against ashfalls. Civil aviation authorities must also 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.  If possible aircraft should avoid flying on the western side of the volcano as volcanic debris are likely to be carried in this direction by the prevailing winds.  Furthermore, 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. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s activity and any new significant development will be immediately relayed to all concerned.

 DOST-PHIVOLCS

 

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