Bulusan volcano news:
Bulusan volcano (Philippines): new phreatic explosion, ash plume of 2000 m
Friday Jun 10, 2016 07:46 AM | BY: T
Eruption of Bulusan volcano this morning (PHILVOLCS)A sudden eruption occurred this morning (at 11:35 local time). An explosion generated an ash plume that rose about 2000 m above the volcano's summit and drifted northwest, causing light ash falls in nearby downwind areas.
According to PHILVOLCS, the eruption preceded by a seismic swarm with more than 100 small earthquakes and lasted 5 minutes. The eruption itself was only steam-driven - no magma itself has reached the surface,- and caused by explosion of over-pressurized and over-heated fluids from the volcano's strongly developed hydrothermal system.
A similar explosion had occurred on 21 February. Following it, scientists monitoring the volcano have been seeing an inflation of the edifice (swelling of the ground) since May, probably caused by magma intruding at depth. This would have been providing new energy (heat) to the system and cause increasing instability.
Bulusan's official status remains unchanged at "Alert Level 1 (abnormal)" on the scale of 0 (normal) to 5 (highest):
"This indicates that hydrothermal processes are underway beneath the volcano that may lead to more steam-driven eruptions. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or phreatic eruptions." (PHILVOLCS)
Monday, Feb 22, 2016
An unexpected small eruption occurred at the volcano yesterday afternoon. At 17:01 local time, two successive small explosions from a fissure vent on the west-northwestern part of the summit crater produced an ash plume that rose approx. 500 meters and caused light ash fall in some nearby villages such as Juban 11 km NW and Irosin 8 km SSW of the volcano. ... [more]
Monday, Jul 20, 2015
PHIVOLCS reported that at 1310 on 17 July an explosion at Bulusan, detected by the seismic network for 11 minutes, generated an ash plume that rose 200 m above the crater and drifted WNW. ... [more]
Saturday, Jun 20, 2015
Another eruption, moderately strong, occurred 14:55 last Friday, producing an ash column that rose 1.5 km. The eruption was not directly visible, only parts of the ash plume could be spotted, but could be heard as rumbing in Monbon village. ... [more]
Tuesday, Jun 16, 2015
Two small steam-driven (i.e. phreatic) explosions occurred at the volcano this morning at 11:02 and 11:20 local time, PHILVOLCS reported. ... [more]
Saturday, May 23, 2015
During 13-15 and 17-19 May PHIVOLCS reported that six or fewer volcanic earthquakes were recorded at Bulusan. Weak steam emissions were occasionally observed rising from the SW vent and from a vent on the upper NW flank; plumes drifted SW, WNW, or drifted downslope. ... [more]