Natural disaster in South Korea Reportedly Leaves at Least 50 Injured (PHOTO, VIDEO)

Natural disaster in South Korea Reportedly Leaves at Least 50 Injured (PHOTO, VIDEO)

Natural disaster in South Korea Reportedly Leaves at Least 50 Injured (PHOTO, VIDEO)

South Korea decided on Wednesday to postpone the state-administered college entrance exam by a week as a rare 5.4-magnitude quake struck the southeastern city of Pohang and caused fissures in some school buildings there.

Analysts were monitoring "unusual seismic activity" in North Korea, the head of the nuclear test monitoring agency CTBTO said.

The quake was centered off the coast about 9.3 kilometers (5.8 miles) northwest of the port city of Pohang, according to the U.S. Geological Survey.

Experts from South Korea warned today that the 5.4 magnitude quake that shook Pohang today in the southeast of the country could be a prelude to bigger ones.

No reports have emerged so far about casualties or damage.

Tremors were felt across the nation including Seoul and Busan, with some residents in the affected areas reporting damage.

The KMA sent an natural disaster alert via the national mobile network and asked some local residents in the affected areas to evacuate immediately.

Pohang is some 35km from the Wolseong Nuclear Power Plant, which has six operational reactors.

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