Bulusan volcano (Philippines): new phreatic explosion, ash plume of 2000 m

Fri, 10 Jun 2016, 07:46

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)
All news about: Bulusan volcano
Information about: Bulusan volcano
Previous news
Wed, 8 Jun 2016, 06:00
Bulusan volcano (Luzon, Philippines) - Smithsonian / USGS Weekly Volcanic Activity Report for 8 June-14 June 2016 (New Activity / Unrest)
PHIVOLCS reported that a five-minute-long phreatic explosion at Bulusan began at 1135 on 10 June, and generated an ash plume that rose 2 km and drifted NW. The Alert Level remained at 1, indicating abnormal conditions and a 4-km radius Permanent Danger Zone (PDZ). ... Read all
Mon, 22 Feb 2016, 12:05
Bulusan volcano (Philippines): small phreatic explosion
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. ... Read all
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Wed, 17 Feb 2016, 06:00
Bulusan volcano (Luzon, Philippines) - Smithsonian / USGS Weekly Volcanic Activity Report for 17 February-23 February 2016 (New Activity / Unrest)
PHIVOLCS reported that at 1701 on 22 February explosions at Bulusan generated a steam-and-ash plume that rose 500 m above the WNW fissure vent. The event was accompanied by a high-frequency earthquake followed by low-frequency earthquakes that lasted 4 minutes and 21 seconds. Rumbling sounds were heard in Puting Sapa, Juban, and Bolos, Irosin, and minor amounts of ash fell in barangays Puting Sapa, Sagkayon, and Caladgao in Juban, and barangay Bolos in Irosin. ... Read all
Mon, 20 Jul 2015, 11:05
Bulusan volcano (Philippines): phreatic explosion on 17 July
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. ... Read all
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Wed, 15 Jul 2015, 06:00
Bulusan volcano (Luzon, Philippines) - Smithsonian / USGS Weekly Volcanic Activity Report for 15 July-21 July 2015 (Continuing Activity)
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. Ashfall was reported in areas to the N and NE in the Sorsogon Province, including Inlagadian (municipality of Casiguran), Tigkiw, Tugawe, Nazareno, Bugtong, and Rizal (municipality of Gubat), and Fabrica, San Isidro, Sta. Cruz, and San Ramon (municipality of Barcelona). ... Read all
Sat, 20 Jun 2015, 11:05
Bulusan volcano (Philippines): phreatic explosion on Friday
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. ... Read all
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Wed, 17 Jun 2015, 06:00
Bulusan volcano (Luzon, Philippines) - Smithsonian / USGS Weekly Volcanic Activity Report for 17 June-23 June 2015 (New Activity / Unrest)
PHIVOLCS reported that the seismic network at Bulusan recorded an explosion-type event that lasted for two minutes on 18 June; dense clouds obscured visual observations of the summit area. A phreatic explosion that occurred at 1455 on 19 June, and lasted for seven minutes, produced a 1.5-km-high grayish ash plume that drifted WSW. A low-level ash cloud on the upper NW flank, possibly from a short pyroclastic flow, was also observed. ... Read all
Tue, 16 Jun 2015, 07:31
Bulusan volcano (Philippines): phreatic explosions this morning
Two small steam-driven (i.e. phreatic) explosions occurred at the volcano this morning at 11:02 and 11:20 local time, PHILVOLCS reported. ... Read all
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Wed, 10 Jun 2015, 06:00
Bulusan volcano (Luzon, Philippines) - Smithsonian / USGS Weekly Volcanic Activity Report for 10 June-16 June 2015 (Continuing Activity)
PHIVOLCS reported that at 1102 on 16 June a 10-minute-long phreatic explosion from Bulusan generated a steam-and-ash plume that rose 1 km and drifted WSW. This event was accompanied by rumbling sounds reported by residents in Cogon, Irosin on the WSW flank. A second and smaller event occurred at 1120 and, based on seismicity, lasted for one minute. ... Read all
Sat, 23 May 2015, 00:37
Bulusan volcano (Luzon Island, Philippines) activity update: steaming, seismic unrest
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. ... Read all

Bulusan volcano (Philippines): new phreatic explosion, ash plume of 2000 m

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