A magnitude 5.6 earthquake struck off the coast of Maconacon, Isabela on Sunday at 5:19 p.m.
The Philippine Institute of Volcanology and Seismology reported that the quake’s depth of focus was 55 kilometers, and its origin was tectonic.
There were no reports of damage, but aftershocks are expected.
Intensity V was reported in Penablanca, Cagayan, with Intensity IV reported in Gonzaga, Cagayan, and Intensity III in Ilagan, Isabela.
Other areas that experienced the earthquake include Casiguran, Aurora; Batac, Pasuquin, and Laoag City in Ilocos Norte; Santiago City, Isabela; Tabuk, Kalinga; and Madella, Quirino, with Intensity II reported.
Intensity I was felt in Bangued, Abra; Baler, Diapaculao, and Aurora; Vigan City and Sinait in Ilocos Sur; and Bayombong, Nueva Vizcaya.
The Philippines sits on the Pacific Ring of Fire, a region known for its high level of seismic activity due to its location along the boundary of several tectonic plates.