MANILA - The Philippine Institute of Volcanology and Seismology (Phivolcs) on Thursday said low-level activity has been observed in the Taal Volcano in Batangas province, while Alert Level 1 (low-level unrest) remains hoisted over the volcano. Seven "significant but shallow tremors" have been recorded since 6:09 a.m. Thursday, and most of these have originated southeast of Taal Volcano Island. "There are tremors near the surface. If these are shallow, it means that there are volcanic fluids near the surface," Phivolcs Director Teresito Bacolcol told the Philippine News Agency. Volcanic tremors are produced by continuous ground vibration caused by movement of volcanic fluids within the volcanic system, he said. Sulfur dioxide (S02) emissions in the past two weeks have been elevated, averaging 5,866 tonnes a day with a peak of 9,623 tonnes recorded last July 6. Bacolcol said Taal's S02 emission reached as low as 1,165 tonnes last June 30. Meanwhile, Phivolcs said an increase in the thermal signatures of Taal main crater was detected, and upwelling of volcanic fluids in the Taal Main Crater Lake has been frequently detected. The public is reminded that there is a threat of eruptive activity since the volcano is in abnormal condition. Sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within Taal Volcano Island (TVI), Taal's permanent danger zone. Those around Taal Lake are advised to be vigilant and prepare in case of further unrest. Aviation authorities are urged to advise pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions may pose hazards to aircraft. (PNA)
Source: Philippines News Agency
