The institute said the quake, which struck at 10:48 a.m. local time, hit at a depth of 8 km, about 11 km northwest of Pagudpud town in Ilocos Norte.
Phivolcs said the quake was also felt in nearby Pasuquin town in Ilocos Norte, Tuguegarao City, Claveria town in Cagayan province, Sinait town and Vigan City in Ilocos Sur province.
The institute said the tremor, which was tectonic in origin, will not cause any damage. However, it said that aftershocks are expected.
The U.S. Geological Survey said the quake has a magnitude of 5.5.
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