The 5.5 magnitude rocked the coast near Pohang in South Korea.
Samsung and SK hynix experienced temporary suspension of chip production in September past year when a more powerful quake struck near Gyeongju south of Pohang.
The tremor occurred in an area 9 km north of the coastal city of Pohang in North Gyeongsang province at 2.29 p.m, according to the Korea Meteorological Administration.
The natural disaster shook South Korea's southeastern coast of Pohang.
The quake's epicentre was about 6km north of the southeastern port city of Pohang, Yonhap news agency reported.
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SMRT chief executive officer Desmond Kuek was spotted at the station around 10.45am but did not address the media at the time. SMRT was recently troubled by a tunnel flooding incident that occurred in October.
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Seo said the North Korean soldier appears to have been shot in five places, adding that he had his first operation on Monday. The attack prompted Washington to fly nuclear-capable B-52 bombers toward the DMZ in an attempt to intimidate North Korea.
South Korea was hit by the country's second biggest ever quake of 5.4- magnitude, with no serious casualty being reported yet, the weather service said Wednesday.
South Korean media showed crumbled walls piled on parked cars, broken windows from some buildings and elementary school students taking shelter on a playground.
There are nuclear power plants and industrial facilities in the area.
The weather agency said the seismic center for the initial quake is 36-point-one degrees north latitude and 129-point-37 degrees east longitude.
South Korean officials are assessing the situation.