China's closest ally North Korea on September 4 carried out a powerful nuclear test, claiming to have developed an advanced hydrogen bomb that could sit atop an intercontinental ballistic missile.
The radiation monitoring, conducted at the northeastern border areas was ended yesterday, a statement from China's Ministry of Environmental Protection (MEP) said.
No abnormal results were showed after eight days of monitoring, the MEP was quoted as saying by the state-run Xinhua news agency.
All monitoring stations in the border areas and surrounding regions, including the provinces of Heilongjiang, Jilin, Liaoning and Shandong, recorded normal radiation levels as of 6 PM yesterday, according to the MEP.
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The ministry said it would switch to routine monitoring after the emergency response ended, conducting automatic radiation monitoring and regular sampling analysis at key border areas.
Some reports earlier said there was marginal increase of radiation in some areas.
The China Earthquake Administration reported that a magnitude 6.3 earthquake struck South Korea at 11:30 AM on September 4 with an epicenter depth of zero km, saying that it might have been caused by explosion.
The Korea Central Television announced on the same day that the country had successfully detonated an H-bomb, a hydrogen bomb that can be carried by an intercontinental ballistic missile.
The explosion from the most recent nuclear test, the North's sixth, was considerably larger than previous tests and was felt by residents in Chinese cities hundreds of kilometres from the border.