Thursday, July 16, 2015

NDRRMC issues updates on Mayon, Bulusan volcanoes


The National Disaster Risk Reduction and Management Council (NDRRMC) has published its latest updates on the activity at Mayon Volcano and Bulusan Volcano, both of which are in the Bicol region.

Mayon Volcano

Mayon Volcano’s alert status is currently at Alert 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. Current conditions may still change and eventually lead to hazardous eruption. The public is still reminded to avoid entry into the 6- km Permanent Danger Zone or PDZ due to perennial hazards of rockfalls, avalanche, ash puffs and sudden steam-driven or phreatic eruptions at the summit area. Furthermore, people living in valleys and active river channels are cautioned to remain vigilant against sediment-laden streamflows and lahars in the event of prolonged and heavy rainfall. PHIVOLCS-DOST is closely monitoring Mayon Volcano’s activity and any new development will be immediately posted to all concerned.

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the past 24 hours. Steaming activity and crater glow was not observed due to thick clouds covering the summit area. Precise leveling surveys on April 30 to May 4, 2015 indicated slight deflation of the edifice relative to the March 2015 surveys, although the edifice remains inflated relative to baseline levels.

Precautionary Measures

The public is still reminded to avoid entry into the 6-km Permanent Danger Zone or PDZ due to perennial hazards of rockfalls, avalanche, ash puffs and sudden steam-driven or phreatic eruptions at the summit area. Furthermore, people living in valleys and active river channels are cautioned to remain vigilant against sediment-laden streamflows and lahars in the event of prolonged and heavy rainfall. PHIVOLCS-DOST is closely monitoring Mayon Volcano’s activity and any new development will be immediately posted to all concerned

Mt. Bulusan

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are underway beneath the volcano that may lead to more steam-driven eruptions. Bulusan volcano’s (12046.2°N, 124°03.E°) seismic monitoring network did not detect any volcanic earthquake during the past 24 hours. Steaming activity was not observed due to thick clouds covering the summit area. Precise leveling surveys on 23-28 June 2015 indicate very slight inflation of the volcano’s edifice relative to May 2015.

Precautionary Measures

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. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft. Furthermore, people living within valleys and along river/stream channels especially on the southwest and northwest sector of the edifice 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 condition and any new development will be relayed to all concerned.
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