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MAYON VOLCANO BULLETIN 17 August 2013 8:00 A.M.
Friday, 16 August 2013 22:24

 

Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network did not detect any volcanic earthquake during the past 24-hour observation period. Moderate emission of white steam plume was observed drifting northeast. No crater glow was observed last night. Sulfur dioxide (SO2) emission on 14 August 2013 was measured at an average of 322 tonnes/day. Ground deformation survey (precise leveling) on the 2nd week of August 2013 showed slight inflation of the edifice compared to May 2013, with the volcano still slightly inflated compared to January 2010 baselines.

Mayon Volcano’s alert status remains at Alert Level 1, which means that it is at abnormal condition.  Although this means that presently no magmatic eruption is imminent, it is strongly advised that the public refrain from entering the 6-kilometer radius Permanent Danger Zone (PDZ) due to the perennial life-threatening dangers of rockfalls, landslides/avalanches at the middle to upper slope, sudden ash puffs and steam-driven or phreatic eruptions from the summit. Active stream/river channels and those identified as perennially lahar-prone areas on all sectors of the volcano should also be avoided especially during extreme weather conditions when there is heavy and prolonged rainfall. DOST-PHIVOLCS maintains its close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

 
MAYON VOLCANO BULLETIN 19 June 2013 8:00 A.M.
Tuesday, 18 June 2013 23:43

Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network did not detect any volcanic earthquake during the past 24-hour observation period. Steaming activity was not observed due to thick clouds covering the summit crater. No crater glow was observed last night. Sulfur dioxide (SO2) emission on 14 June 2013 was measured at an average of 133 tonnes/day. Ground deformation survey (precise levelling) on the third week of May 2013 showed slight inflation of the edifice compared to February 2012, with the volcano still slightly inflated compared to January 2010 baselines.

Mayon Volcano’s alert status remains at Alert Level 1, which means that it is at abnormal condition.  Although this means that presently no magmatic eruption is imminent, it is strongly advised that the public refrain from entering the 6-kilometer radius Permanent Danger Zone (PDZ) due to the perennial life-threatening dangers of rockfalls, landslides/avalanches at the middle to upper slope, sudden ash puffs and steam-driven or phreatic eruptions from the summit. Active stream/river channels and those identified as perennially lahar-prone areas on all sectors of the volcano should also be avoided especially during extreme weather conditions when there is heavy and prolonged rainfall. DOST-PHIVOLCS maintains its close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

DOST-PHIVOLCS

 
Taal Volcano Bulletin 19 June 2013 8:00 A.M.
Tuesday, 18 June 2013 23:42

Taal Volcano’s (14.0000°N, 120.9833°E) seismic network recorded one (1) volcanic earthquake during the past 24-hour observation period. Field measurements last 13 June 2013 at the western sector of the Main Crater Lake yielded a slight decrease in water temperature of 32.5°C from 33.2°C, increase in water level of 0.25 meter from 0.24 meter, and water acidity remained at pH 3.03.  Ground deformation survey in the Volcano Island on 23 May-01 June 2013 denoted slight deflation at Calauit, Alas-as, Pira-piraso, Daang Kastila and New Eruption Site precise leveling lines compared to the February 2013 survey.  However, GPS data for the period of October 2012 to first week of May 2013 show inflationary changes in ground deformation while the edifice is still slightly inflating in general compared to February 2011 baseline data. Carbon dioxide (CO2) emission at the Main Crater Lake increased to 947 tonnes per day on 03 March 2013 compared to 720 tonnes per day last 27 November 2012.

Alert Level 1 remains in effect over Taal Volcano. This means that hazardous eruption is not imminent. The public, however, is reminded that the Main Crater should be strictly off-limits because sudden steam explosions may occur and high concentrations of toxic gases may accumulate. The northern portion of the Main Crater rim, in the vicinity of Daang Kastila Trail, may also become hazardous when steam emission along existing fissures suddenly increases.  Furthermore, the public is also reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strongly not recommended.

DOST-PHIVOLCS

 
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