The quake was first reported as magnitude 6.7 before being revised to 6.4.
USGS said the tremor occurred at 3.02 am GMT, with the epicenter located 27 kilometers (16.8 miles) east of Santiago in the Cagayan Valley of northeastern Philippines, according to Anadolu Agency (AA).
Philippine Institute of Volcanology and Seismology (Phivolcs) said that there was no tsunami risk to the Philippines, local media outlet Inquirer reported.
So far, there has been no immediate reports of casulaties or damage.
MA/PR
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