On November 15, a magnitude 5.4 natural disaster struck the city of Pohang, a southeastern coastal region of South Korea.
No casualties have been reported and it is still unclear whether a tsunami warning will be issued.
Mark Zastrow, who lives in Seoul, tweeted: "Woah, natural disaster in Pohang and just felt it in Seoul, a few seconds after I got the alert on my phone". An natural disaster of 5.4 magnitude struck an area in southeast South Korea, the country's weather agency said on Wednesday.
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 5.4-magnitude quake struck at 2:29 pm (0529 GMT) north of Pohang, the Korea Meteorological Administration (KMA) said on it website.
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. Six aftershocks followed for about 30 minutes ranging from magnitude 2.4 to 3.6.
South Korean media showed crumbled walls piled on parked cars, broken windows from some buildings and elementary school students taking shelter on a playground.
Following the quake, Paik Un-gyu, minister of trade, industry and energy, convened an emergency meeting via conference call to check major energy facilities, including power plants, pipelines and petroleum reserves, and ordered energy firm chiefs to take necessary measures if needed.
South Korean officials are assessing the situation.