The Philippine Institute of Volcanology and Seismology said there was no immediate tsunami alert, but said it was continuing to monitor northern areas.
The quake was located 117 kilometres northeast of Laoag city in Luzon island at a depth of 50 kilometres, the institute said.
The United States Geological Survey recorded the quake as magnitude 6.0, and said it struck at a depth of 36 kilometres.
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