An quake of 5.5 magnitude on the Richter scale has hit the southeastern city of Pohang, the Korean Times reported. Witnesses stated that the quake could be felt in Seoul, more than 300 kilometers away, including at Gwanghwamun.
Residents in Pohang city just 5.6 miles from the epicentre of the quake were told to evacuate.
Photos and video footage sent to local TV stations showed crumbled street walls and furniture violently shaking inside people's homes and people rushing out of buildings in panic. No casualties have been reported yet.
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The South Korean port city of Pohang is home to the headquarters of Posco - the country's top, and the world's fourth largest, steelmaker.
The tremor occurred in an area 9 km north of the coastal city of Pohang in North Gyeongsang province at 2.29 p.m, according to the Korea Meteorological Administration. According to state nuclear operator Korea Hydro & Nuclear Power, neither of nuclear reactors on the southeastern coast was affected by the quakes.