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Friday, 27 May 2011 21:28

Taal Volcano’s (14.0000°N, 120.9833°E) seismic network recorded six (6) volcanic earthquakes during the past 24 hours. Field measurements conducted on 24 May 2011 at the eastern sector inside the Main Crater Lake showed that the water temperature slightly increased from 32.5°C to 32.8°C, the pH value became more slightly acidic decreasing from 2.83 to 2.67 and the water level increased by 0.04 meter. Results of the ground deformation survey (precise leveling) conducted around the Volcano Island last 26 April - 03 May 2011 showed that the volcano edifice inflated slightly relative to the 05-11 April 2011 survey. Measurement of carbon dioxide (CO2) gas emission rates last 03-04 May 2011 at Taal Main Crater yielded a lower value of 2,057 tonnes per day (t/d) compared with that measured last March 2011 which had a value of 4,750 t/d. However, the obtained value is still higher than the emission rates of 1,875 t/d measured last February 2011.  

Alert Level 2 is still in effect over Taal Volcano, with the interpretation that magma has been intruding towards the surface, as manifested by the continuing high emission rate of CO2 being released in the Main Crater Lake and sustained seismic activity.  Hence, PHIVOLCS advises the public that the Main Crater, Daang Kastila Trail and Mt. Tabaro (1965-1977 Eruption Site) are strictly off-limits because sudden hazardous steam-driven explosions may occur and high concentrations of toxic gases may accumulate.  Breathing air with high concentration of toxic gases can be lethal to human, animals and even cause damage to vegetation.  In addition, it is reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strictly not recommended.  DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately relayed to all concerned.





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