There were no immediate reports of deaths or injuries in the quake, which the United States Geological Survey earlier measured at 6.6. The quake struck at 1:28 pm (0528 GMT) 10.7 km (6.6 miles) southeast of Nasugbu, in the province of Batangas, at a depth of 168 km (104 miles), Reuters reported.
No tsunami warning was issued by the Philippine Institute of Volcanology and Seismology, which put the magnitude of the quake at 6.3, and said it expected aftershocks.
The Philippines is on the geologically active Pacific Ring of Fire and experiences frequent earthquakes.