A 5.1 magnitude earthquake struck off Babuyan Islands at 2:48 p.m. on Tuesday, the US Geological survey said.
There were no reports of damage or injuries from the quake that hit 105 kilometers north-northeast of northern city of Laoag.
The undersea tremor occurred at a shallow depth of 10 kilometers.
On Monday, two moderate earthquakes struck about 14 hours apart off Southern Mindanao.
At 6:15 p.m., a 5.4 magnitude quake hit 175 kilometers southeast of Davao City at a depth of 99.5 kilometers.
Earlier, a magnitude 5 earthquake struck 120 kilometers east-southeast of General Santos City at a depth of 148.4 kilometers.
The Philippines sits on the Pacific “Ring of Fire” where continental plates collide causing frequent seismic and volcanic activity.