The Philippine Institute of Volcanology and Seismology (Phivolcs) has detected 51 volcanic earthquakes, including 41 episodes of volcanic tremor having durations of one to four minutes, in the 24-hour monitoring of the Taal Volcano--from 8 a.m., March 9 to 8 a.m., March 10.
In its volcano bulletin issued on Wednesday, March 10, Phivolcs said the activity at the Taal Volcano's main crater consisted of weak emission of steam-laden plumes that reached five meters high.
Temperature highs of 71.8 degrees Celsius and pH of 1.59 were last measured from the main crater lake on March 4 and Feb. 12, 2021, respectively, Phivolcs said.
It noted that ground deformation parameters also indicated a very slow and steady inflation and expansion of the Taal region after the January 2020 eruption.
Considering these observations, Phivolcs said Taal Volcano will remain under alert level 2 due to "increased unrest."
The possibility of sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall, and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within the Taal Volcano island, it warned.
Phivolcs asked to public to prevent from entering the volcano island, which is a permanent danger zone, especially the vicinities of the main crater and Daang Kastila fissure.
Local government units were advised to continuously assess and strengthen the preparedness of previously evacuated barangays around Taal Lake in case of renewed unrest.
Civil aviation authorities were also asked to advise pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircraft.