|Taal Volcano Bulletin, 21 May 2013, 8:00 A.M.|
|Monday, 20 May 2013 23:02|
Taal Volcano’s (14.0000°N, 120.9833°E) seismic network did not detect any volcanic earthquake during the past 24-hour observation period. Field measurements last 16 May 2013 at the western sector of the Main Crater Lake yielded a slight increase in water temperature of 32.8°C from 32.6°C, decrease in water level of 0.22 meter from 0.24 meter, and water acidity remained at pH 3.07. Ground deformation survey in the Volcano Island on 13-24 February 2013 denoted slight inflation at Calauit, Alas-as, Pira-piraso, Daang Kastila and New Eruption Site precise leveling lines. Furthermore, GPS data for the period of October 2012 to first week of May 2013 show inflationary changes in ground deformation while the edifice is still slightly inflating in general compared to February 2011 baseline data. Carbon dioxide (CO2) emission at the Main Crater Lake increased to 947 tonnes per day on 03 March 2013 compared to 720 tonnes per day last 27 November 2012.
Alert Level 1 remains 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 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 become hazardous when steam emission along existing fissures suddenly increases. Furthermore, the public is also reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strongly not recommended.