|BULUSAN VOLCANO BULLETIN 17 December 2010 8:00 A.M.|
|Friday, 17 December 2010 07:37|
At 2:17 P.M. yesterday, an explosion occurred at the summit crater of Bulusan Volcano (12°46.2’N, 124°03’E). The explosion produced a grayish steam and ash column that rose to about 500 meters above the crater rim and drifted to the southwest. The event was recorded as an explosion-type earthquake lasting for three minutes. Field investigation carried out immediately after the explosion showed that no ashfall was observed beyond the 4-km Permanent Danger Zone (PDZ). During the past 24 hours, four (4) volcanic earthquakes were detected by the Bulusan seismic network. No steaming was observed at the northwest and southeast vents while weak to very weak steam emission were seen rising from the summit crater. No sulfur dioxide (SO2) flux was detected during the measurements conducted yesterday.
Alert Level 1 remains enforced over Bulusan Volcano area. The public is strongly advised not to enter the 4-kilometer radius Permanent Danger Zone (PDZ) because the area is at risk to sudden steam and ash explosions. Because of the prevailing wind direction, people residing 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 pose hazards to aircrafts. Furthermore, residents near valleys and river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and continuous rainfall. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s activity and any new significant development will be immediately relayed to all concerned.