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Friday, May 1, 2015

Bulusan Volcano spews steam, ash

Sorsogon's Bulusan Volcano produced a steam and ash explosion which lasted for 5 minutes at 8:09 a.m. earlier today, May 1, the Philippine Institute of Volcanology and Seismology reported.

"Bulusan Volcano 1" by Bryan Fajardo Jr., Joel France and Joseph Sachs Shepherd - Own work.
Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Bulusan_Volcano_1.jpg#/media/File:Bulusan_Volcano_1.jpg
"At around 10:30 AM, when the crater became visible, strong to moderate, dirty white steaming was observed which reached 200 m high and drifted west-northwest coming from the northwest vent of the volcano. Only five (5) volcanic earthquakes were detected during the past week by the Bulusan seismic network. After the steam and ash explosion, the network has recorded approximately forty (40) volcanic earthquakes," the advisory added.

Despite the explosion, Phivolcs clarified that Alert Level 0 status prevails over the volcano.

Nonetheless, it cautioned local government units and the public against "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."

"Civil aviation authorities," Phivolcs announced, "must also advise pilots to avoid flying close to the volcano’s summit as ejecta from any sudden phreatic eruption can be hazardous to aircraft. 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."

It also assured the public that it is closely monitoring the volcanic activity.

Volcanic activity


According to the institution's records, Bulusan volcano has had 16 historical eruptions.

The latest eruption or activity was between November 6, 2010 to May 13, 2011.

The types of hazards include pyroclastic flows (hot blasts, hot avalanche), lava flows, lahars, and ashfall.

Bulusan is the fourth most active volcano in the Philippines, following Mayon, Taal, and Kanlaon.

Mayon at alert level 2

Meanwhile, at 8 a.m. today, Phivolcs reported that Mayon's alert status is at level 2.

"This means the volcano is at a moderate level of magmatic unrest. Although the volcano is currently exhibiting low-level of seismic activity, ground deformation data indicates that eruptible magma had already accumulated the previous year beneath the edifice," the advisory stated.—BICOLSTANDARD.COM
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