The Taal volcano, located 45 miles south of Manila spewed a 0.62 mile high plume of gas and steam into the air.
Authorities raised the alert level to 3 on the 5-level scale,which the seismology and volcanology agency said meant a "magmatic intrusion" at the main crater "could further drive succeeding eruptions".
Taal is one of the world's smallest active volcanoes, standing at 1,020 feet. An eruption in 1911 killed more than 1,300 people.
In January last year, Taal shot a column of ash and steam as high as 15 km into the sky, which forced more than 100,000 people to abandon their homes, widespread flight cancellations and heavy ash falls in Manila.