Two earthquakes with the magnitudes of 5.5 and 5.4 have struck off South Korea's southeastern coast, about 6km north of the port of Pohang, the national meteorological service said.
It's the strongest quake in South Korea since a 5.8-magnitude occurred near the ancient city of Gyeongju, which is close to Pohang, in September 2016, Korea Meteorological Administration officials said.
The outer wall of an elementary school in Pohang has fallen after a magnitude 5.5 quake hit the southeastern city on November 15, 2017.
The Cultural Heritage Administration said Wednesday that there is no immediate damage detected to historic buildings and artifacts in Gyeongju, a city adjacent to earthquake-struck Pohang.
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But when organizers realized about 500 people were planning to attend, the service was moved outside. It's been a hard week for the community of few that is located southeast of San Antonio.
South Korea has relatively little seismic activity, compared with Japan to the east.
Images posted on social media showed shattered storefronts, goods tumbled off store shelves, cars smashed by fallen bricks and cracks on the ground.
Korea Hydro & Nuclear Power (KHNP) said the six nuclear reactors in Gyeongju, about 45 kilometers south of the epicenter, as well as other reactors on the southeastern coast are all functioning normally. The Pohang natural disaster is the strongest Korea has experienced since 2016, after the magnitude 5.8 quake in Gyeongju.