LAOAG CITY – A magnitude 4.9 earthquake shook Cagayan and nearby provinces in northern Luzon at 5:39 a.m. Thursday, state seismologists said.
With the epicenter located 20 kilometers northwest of Dalupiri Island (Calayan) in Cagayan, the earthquake was tectonic in origin with a depth of 16 kilometers, according to the Philippine Institute of Volcanology and Seismology.
Residents in these areas are advised to take precautionary measures as aftershocks are expected. No damage was recorded so far, authorities said.
Reported intensity is the traditional way of knowing the intensity based on reports of people who felt the earthquake. Instrumental intensity, on the other hand, is measured using an intensity meter that measures ground acceleration.
Magnitude measures the size of an earthquake at its source, or the amount of energy released. (PNA)