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Philippine Institute of Volcanology and Seismology, Powered by Joomla!
TAAL VOLCANO BULLETIN, 10 April 2011, 8:00 A.M. PDF Print
Sunday, 10 April 2011 00:31

Taal Volcano’s (14.0000°N, 120.9833°E) seismic network recorded six (6) volcanic earthquakes during the past 24 hours. Field observation and measurements conducted at the eastern sector inside the Main Crater Lake (via Calauit) on 5 April 2011 showed that steaming activity at the thermal area was weak. The water level further receded from 0.36 m to 0.33 m.  Water temperature slightly increased from 30.0°C to 30.5°C and pH value also slightly increased to 2.84 as compared to the last reading of 2.82 on 29 March 2011 denoting that the water became slightly less acidic.  Gas measurements conducted at Taal Main Crater Lake last January, February and March 2011 yielded CO2 emission values of 2,250 tonnes per day (t/d), 1,875 t/d and 4,670 t/d respectively. The remarkable increase in C02 concentration indicates anomalous gas release from the magma at depth. Result of the ground deformation survey (precise leveling) conducted around the Volcano Island last 02-09 February 2011 showed that volcano edifice is slightly inflated as compared with the 15-23 December 2010 survey.

Alert Level 2 is hoisted over Taal Volcano with the interpretation that magma has been intruding towards the surface, as manifested by CO2 being released in the Main Crater Lake that could eventually lead to an eruption.  Hence, PHIVOLCS advises the public that the Main Crater, Daang Kastila Trail and Mt. Tabaro (1965 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 gases can be lethal to human, animals and even cause damage to vegetation.   In addition, it is reminded that 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.