Phivolcs said movement of the Vigan-Vintar Fault triggered the earthquake and its epicenter was located 19 kilometers northeast of Laoag City.
The quake registered a magnitude of 3.4 on the Richter Scale but it was felt only at Intensity 2 in Pasuquin, Ilocos Norte and Penablanca, Cagayan, Phivolvs also said.
The quake is expected neither to cause damage nor be followed by aftershocks, Phivolcs added. Felix delos Santos