South Korea's meteorological agency said early indications suggested it was a natural quake because no soundwaves specific to man-made tremors had been identified.
Kim on Friday threatened the "highest level of hard-line countermeasure in history" in a tirade against Trump's warning that Washington would "totally destroy" the North if the USA or its allies were threatened.
The "quake" occurred at approximately 08:30 GMT (16:29 local time) on Saturday, reports South Korea's Yonhap news agency.
A Nuclear Test Monitoring Agency has reported two seismic events in North Korea.
North Korea's nuclear tests to date have all been underground, and experts say an atmospheric test, which would be the first since one by China in 1980, would be proof of the success of its weapons program.
President Trump has accused China of not putting enough pressure on Kim's regime to step back from its sabre-rattling.
North Korea has been maintaining a torrid pace in nuclear and weapons tests as it accelerates its pursuit of nuclear weapons that could viably target the United States and its allies in Asia.
Ri emphasized that North Korea has the know-how to carry out its threat.
India expected to focus on Pakistan, terrorism
According to some estimates, the USA issues 85,000 H1-B visas every year out of which Indians reportedly get about 60,000 visas. The reality is that Pakistan's politicians remember everything, but manipulate their memory according to their convenience.
Saturday's quake follows an escalation of the combative rhetoric between the North Korean and United States leaders this week.
"We can never stand by idly about it", it said.
Seismic activity in North Korea could be a missile test.
The mission in global airspace on Saturday was said to show how seriously President Donald Trump takes North Korea's "reckless behavior".
In a speech last week at the United Nations, Trump had issued the warning of potential obliteration and mocked the North's young autocrat as a "Rocket Man" on a "suicide mission".
"We use several methods to tell whether earthquakes are natural or manmade", said the official, who asked for anonymity. "I will surely and definitely tame the mentally deranged U.S. dotard with fire".
"It is a foolish misjudgment if Trump's gang thinks that America is safe because it's far away from the Korean Peninsula".
President Trump had recently ordered fresh sanctions over Pyongyang's weapons programmes and even praised China for taking an action to limit financial transactions with North Korea.
And it's possible that North Korea is able to undermine them.
The natural disaster was detected in an area around Kilju, in north-east North Korea.