Here's Phivolcs bulletin on Taal Volcano posted on April 18, 2011:
Twenty one (21) volcanic earthquakes were recorded by the seismic network around Taal Volcano (14.0000°N, 120.9833°E) during the past 24 hours. One (1) of these events which occurred at 10:06 A.M. yesterday was felt by residents at Intensity II in Brgy. Calauit. Water temperature at the Main Crater Lake (west-side via Alas-as) slightly increased from 29.8°C to 30.1°C. Gas measurements conducted at Taal Main Crater Lake last January, February and March 2011 yielded carbon dioxide (CO2) emission values of 2,250 tonnes per day (t/d), 1,875 t/d and 4,670 t/d respectively. This large rise in C02 concentration indicates gas release from the magma at depth. Result of the ground deformation survey (precise leveling) conducted around the Volcano Island last 05-11 April 2011 showed that volcano edifice is slightly inflated as compared with the 02-09 February 2011 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 and increase in 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 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.