SEOUL - A rare earthquake of magnitude 5.4 rattled South Korea on Wednesday, its second most powerful quake on record, shaking buildings but causing no major damage or injuries.
The quake struck about 9 km (5 miles) north of the southeastern port city of Pohang, the Korea Meteorological Administration said in a news briefing.
Tremors were felt across the country but operations at nuclear reactors were not affected, the state-run nuclear operator Korea Hydro & Nuclear Power Co said in a statement.
South Korea has relatively little seismic activity, compared with Japan to the east.
Its strongest quake on record was magnitude 5.8 in September last year.