Residents in the capital, more than 300 kilometers (186 miles) away, felt tremors and said their buildings shook. No injuries or major damages were immediately reported, according to the Korea Meteorological Administration.
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.
South Korea has relatively little seismic activity, unlike neighboring Japan.
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