A magnitude 4.1 earthquake was recorded early Thursday, Oct. 9, in the island town of Panukulan, Quezon province.
The Philippine Institute of Volcanology and Seismology (Phivolcs) said the tectonic tremor struck 25 kilometers northeast of the municipality at a depth of 10 kilometers around 2:51 a.m.
A tectonic earthquake is caused by the sudden movement of rocks along faults and plate boundaries.
Instrumental Intensity I was recorded in the coastal town of Infanta on the mainland part of northern Quezon. Instrumental intensities are determined using an intensity scale.
Phivolcs said it does not expect any damage or aftershocks from the quake.
Panukulan and two other municipalities Polillo and Burdeos are located on Polillo Island off Lamon Bay, facing the Pacific Ocean in the northern part of the province.