|TAAL VOLCANO BULLETIN 30 June 2011 8:00 A.M.|
|Thursday, 30 June 2011 07:25|
Taal Volcano’s (14.0000°N, 120.9833°E) seismic network recorded two (2) volcanic earthquakes during the past 24 hours. Field measurements conducted last 28 June 2011 at the eastern sector inside the Main Crater Lake showed that the water temperature increased from 32.9°C to 33.4°C, the water level increased from 0.59 meter to 0.74 meter and the pH value showed insignificant change from 2.76 to 2.74 as compared with the previous readings on 14 June 2011. Minimal bubbling activity was observed at the middle portion of the Main Crater Lake. Results of the ground deformation survey (precise leveling) conducted around the Volcano Island last 1 - 10 June 2011 showed that the volcano edifice is slightly inflated relative to the 26 April - 03 May 2011 survey. Measurement of carbon dioxide (CO2) gas emission rates last 03-04 May 2011 at Taal Main Crater Lake yielded a value of 2,057 tonnes per day (t/d) which is above the background level.
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.