A 5.4 magnitude natural disaster shook South Korea's southeastern coastal region Wednesday afternoon raising fears North Korea could have launched another missile test.
While the US Geological Survey says it was centered off the coast about 9.3 kilometers northwest of Pohang, state-run Korea Meteorological Administration said the epicenter was inside Pohang.
Tremors were felt in the South Korean capital Seoul, around 270km from Pohang, Yonhap added.
There have been no reports of human casualties so far.
The initial quake was recorded at a depth of 10km, USGS said.
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The outer wall of an elementary school in Pohang has fallen after a magnitude 5.5 natural disaster hit the southeastern city on November 15, 2017.
South Korean media say an quake measuring magnitude 5.5 has hit off the country's southeastern coast.
South Korea has relatively little seismic activity, unlike neighboring Japan. No damage to them has been reported.
Local nuclear reactors were operating without disruption, Yonhap news agency said, citing officials at Korea Hydro and Nuclear Power.
South Korean President Moon Jae-In, on his way to Seoul after attending the Asean summit in Manila, is set to hold an emergency meeting upon arrival, his office said.