South Korea suffered their second most powerful quake ever this morning after a rare earthquake of magnitude 5.4 rattled South Korea, 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.
According to Reuters 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.
An artificial earthquake movement of a magnitude 6.3 on the Richter scale was recorded near the Poonggaeri area in North Korea a South Korean military official told NBC News in September 2017.
The event was recorded around 14 miles northeast of Sungjibaegam the USGS said.
China's earthquake administration says the quake was a "suspected explosion,"