A 5.4-magnitude quake struck eastern South Korea on Wednesday (Nov 15), according to the United States Geological Survey (USGS).
No casualties have been reported and it is still unclear whether a tsunami warning will be issued. South Korea's state-run Korea Meteorological Administration measured the quake at the same strength but said the epicenter was inside Pohang.
Residents in Pohang city just 5.6 miles from the epicentre of the quake were told to evacuate.
Before the main tremor, earthquakes of 2.2 and 2.6 magnitude struck areas near Pohang city.
South Korea has relatively little seismic activity, compared with Japan to the east. They hit some 35km from a nuclear power plant, but no damage is reported.
Photos and video footage sent to local TV stations showed crumbled street walls, furniture violently shaking inside people's homes and people rushing out of buildings in panic.
A total of nine quakes were reported in the area, which is only 25 kilometers from Gyeongju, where the nation's most powerful quake of magnitude 5.8 happened in September 2016.
Nuclear power plants in Gyeongju and the surrounding areas are reported to be safe and unaffected by the quake.
South Korean officials are assessing the situation.
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