The tremor was detected in the Kilju area in the North Hamgyong province hours after Donald Trump mocked 'madman' Kim Jong-un and the dictator called the US President a 'rabid dog'.
The earthquake was felt at 3.30am ET (8.30am GMT) at a depth of zero miles, with China's official Xinhua News Agency saying it was a 'suspected explosion'.
A tremor earlier this month was caused by Kim's sixth nuclear test so it's no surprise there are fears this is another.