Bulusan volcano news:
Bulusan volcano (Philippines), activity update: steaming, slight deflation, alert level remains at 1 (unrest)
No eruptions have occurred at Bulusan volcano in recent weeks, and signs of unrest have decreased compared to end of December last year. Nevertheless, the Philippine Institute of Volcanology and Seismology (PHILVOLCS) keeps the volcano at alert level 1 (unrest, eruptions possible within weeks to months).
From the 24 Feb bulletin:
"1 volcanic earthquake was detected during the past 24 hours by Bulusan\'s seismic network. Periodic wispy to weak emission of white steam plumes could be observed.
Ground deformation survey (precise leveling) last 27-31 January yielded slight deflation at both Inlagadian leveling line on the north-northeast flank and at Mapaso leveling line on the south-southeast flank relative to the previous survey last 14-18 November 2011.
Bulusan Volcano’s status remains at Alert Level 1. Entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to sudden steam and ash eruptions. Due to the prevailing wind direction, residents in the northwest and southwest sectors of the volcano are reminded to take precautions against ashfall from sudden eruptions. Civil aviation authorities must also warn pilots to avoid flying close to the volcano’s summit as ejecta from sudden eruptions may be hazardous to aircraft. If possible, aircraft should avoid airspace west of the volcano as volcanic ash is likely to be dispersed in this direction by prevailing winds. Furthermore, people living within valleys and along 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 development will be relayed to all concerned."
Links / Sources:
An explosion from Bulusan on 12 May produced an ash plume that rose to an altitude of 5.6 km (18,400 ft) a.s.l. and drifted WSW and WNW. The activity was accompanied by rumbling sounds and was recorded by the seismic network as an explosion-type earthquake that lasted about 35 minutes.... [more]
After 3 montsh of relative quiet, Bulusan had another (probably phreatic or phreatomagmatic) eruption today, Easter Sunday. The eruption lasted for 20 minutes and produced an ash colum that rose 2,5 km into the sky.[more]
As PHILVOLCS reports an ash explosion occurred at Bulusan Volcano at 1:09 am local time on 20 December 06. The explosion was not observed dur to thick clouds, but clearly recorded as seismic signals, rumbling sounds and lightning flashes that lasted for about 20 minutes.... [more]