Active Volcanoes in the Philippines

Taal Volcano

Taal Volcano’s (14.0000°N, 120.9833°E) seismic network detected one (1) volcanic earthquake during the past 24 hours.

Field measurements on 24 January 2012 at the western sector of the Main Crater Lake yielded slightly increased water temperature from 31.2°C to 31.3°C, decreased water level from 0.93 meters to 0.83 meters and slightly more acidic pH from 2.77 to 2.75.

Ground deformation survey (precise leveling) on the Volcano Island last 21- 27 October 2011 indicated no significant change compared with July 2011, but is nonetheless still inflated compared with baseline data.

GPS data for the period of February to first week of November 2011 show slight deflation in Taal Volcano Island beginning August, but nonetheless also indicate that the edifice is still slightly inflated compared to February baseline data.

Carbon dioxide (CO₂) emission at the Main Crater Lake decreased to 482 tonnes per day on 18 October 2011 compared from the previous readings of 1,821 tonnes per day last 27 June 2011.

Alert Level 1 is 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 to the public 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 be hazardous when increased steam emission is reactivated along existing fissures.

Taal Volcano Hazard Maps: Balistic | Surge | Water

Mayon Volcano

Mayon Volcano’s (13.2500°N, 123.6833°E) seismic network detected one (1) rock fall event during the past 24 hours.

Weak to moderate emission of white steam drifting toward northwest and west-northwest was observed.

Crater glow could not be observed last night due to thick clouds covering the summit area.

Measurement of sulfur dioxide (SO₂) emission rate last 12 January 2012 yielded an average of 255 tonnes per day.

Ground deformation survey (precise leveling) conducted last 09 – 13 November 2011 indicated a slight deflation of the edifice as compared with 21 – 25 August 2011.

Alert Level 1 is in effect over Mayon Volcano. Although this means that no eruption is imminent, it is recommended that the public should not enter the 6-kilometer radius Permanent Danger Zone (PDZ) due to the continuing threat from sudden small explosions and rockfalls from the upper and middle slopes of the volcano. Active stream/river channels and those perennially identified as lahar prone areas in the southern sector should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Mayon Volcano and any new development will be relayed to all concerned.

Mayon Volcano Hazard Maps: Ash | Lahar | Lava | Pyroclastic

Bulusan Volcano

Bulusan Volcano (12.7667°N, 124.0500°E) seismic network detected no volcanic earthquake during the 24-hour observation period.

Steaming activity could not be observed due to thick clouds covering the summit.

Ground deformation survey (precise leveling) last 14-18 November 2011 yielded slight inflation at both Inlagadian leveling line on the north-northeast flank and at Mapaso leveling line on the south-southeast flank relative to the previous survey last 16 - 20 August 2011

Alert Level 1 status is strongly reiterated over Bulusan Volcano. 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 steam and ash eruptions. Civil aviation authorities must also warn pilots to avoid flying close to the volcano’s summit as ejecta from sudden eruptions may 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. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s activity and any new development will be relayed to all concerned

Bulusan Volcano Hazard Maps: Lava | Pyroclastic

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