Monday, 16 May 2011 13:10

This is a notice of significant seismic activity of Bulusan Volcano.


Following the ash explosion on 13 May 2011, Bulusan’s seismic activity was at moderate level. During the 24 hour observation period (5:00 A.M. 15 May to 5:00 A.M. 16 May), Bulusan Volcano’s seismic network detected four volcanic earthquakes. However, between 5:00 A.M. to 12:00 noon today, the number of volcanic earthquakes detected around Bulusan Volcano rapidly increased.  A total of 80 (eighty) volcanic earthquakes was detected.


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 aircrafts. If possible aircrafts 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.






list of barangay at risk