TAIPEI (Taiwan News) — A magnitude 4.9 earthquake struck Yilan County at 4:47 p.m. Sunday, according to the Central Weather Administration.

The epicenter was located 45.4 kilometers south of Yilan County Hall at a depth of 5.9 kilometers, classifying the quake as very shallow, the CWA said.

The earthquake’s maximum intensity measured magnitude 4 in Yilan County. Intensity levels of 2 were recorded in Nantou, Taichung, New Taipei, and Taipei, while the rest of the country registered an intensity of 1.

Taiwan uses a 1–7 scale to measure earthquake intensity at specific locations.

Wu Chien-fu (吳健富), director of the CWA’s Seismological Center, said the quake was not an aftershock of the magnitude 7.0 earthquake that struck on Dec. 27. Due to its southern location and shallow depth, it was initially determined to be an independent event, per UDN.

Wu said the earthquake was mainly caused by the subduction of the Philippine Sea Plate beneath the Eurasian Plate, noting that about 70% of Taiwan’s earthquakes occur in this tectonic region.