Manila: Philippine authorities on Monday maintained the alert level for the Taal volcano which entered its second week of eruption amid risks of a lava explosion, though smoke and ash emissions have diminished.
Renato Sodium, head of the Philippine Institute of Volcanology and Seismology, said that although the volcano seemed calm, underground volcanic activity shows the opposite, so the alert level, set on January 12, remains at 4 out of 5.
"There is magma rising to the surface," the expert said.
Phivolcs reported that frequent volcanic earthquakes around Taal - 714 since the eruption began, 175 of them noticeable - indicate that magma continues to rise to the surface from the subsoil which can lead to an eruption.
Sodium explained that the magma movement has caused the volcano te elevate causing deep fissures and cracks on the surface which have also been seen in the towns near Taal, located 60 km south of the capital Manila.
Taal is a small 311-meter high volcano that forms an island in the middle of a lake of the same name.
"Lake Taal is stretching, the land is rising and the water level is going down, and the water in the main crater has evaporated while new smaller craters have been created," Sodium said.