Another Korea Meteorological Administration official, who also didn't want to be named, said the agency saw the possibility of the quake being caused by a tunnel collapse as low.
Officials with The Comprehensive Nuclear-Test-Ban Treaty Organization also said their initial analysis is that the quake was unlikely to be man-made.
On Friday, Russia urged "hot heads" to calm down as the United States admitted it felt "challenged" by North Korea's warning that it could test a hydrogen bomb over the Pacific. On its website, the USGS said that it "cannot conclusively confirm at this time the nature (natural or human-made) of the event".
North Korea's foreign minister said this week that his country could test a powerful nuclear weapon over the Pacific Ocean in response to President Donald Trump's threats of military action.
All North Korea's nuclear tests registered as earthquakes of magnitude 4.3 or above.
China's natural disaster administration said it was a magnitude 3.4 quake and cited a "suspected explosion".
Ryanair to recruit 125 new pilots in the 'next week or two'
He dismissed talk of possible industrial action, including reported plans for a work-to-rule, saying: "There isn't a union". Separately, some Ryanair pilots have spoken to the BBC about a "toxic" atmosphere and how they felt "undervalued".
Kim vowed to take the "highest-level" action in response to US President Donald Trump's threat at the United Nations to "totally destroy" the North over its nuclear and missile programmes. The move escalated tensions with the USA and North Korea's neighbors, and this week its foreign minister said the regime's options included testing a hydrogen bomb in the Pacific Ocean.
Kim earlier this week called Mr Trump "deranged" and said he would "pay dearly" for his threats.
Wang told Japan Foreign Minister Taro Kono on the sidelines of a United Nations meeting in NY that the situation on the Korean peninsula was getting increasingly serious and all sides needed to remain calm.
Trump announced new US sanctions on Thursday that he said allows the targeting of companies and institutions that finance and facilitate trade with North Korea US Treasury Secretary Steven Mnuchin also said banks doing business in North Korea would not be allowed to operate in the United States.
One - titled "We will throw the irrational war fanatics of Trump's gang in the fire of justice" - condemned Trump's United Nations speech as "rubbish".
3.4 magnitude quake detected in North Korea
Much attention has been paid to the commercial and financial ties between China and North Korea in recent months. All of North Korea's previous six nuclear tests registered as earthquakes of magnitude 4.3 or above.
The article said, "For more than seven decades since the foundation of the UN, no chief executives or diplomats including the preceding USA presidents have openly called for the obliteration of another state" at the UN General Assembly. Luther Strange, Trump lashed out against Kim, telling the crowd, "we can't have madmen out there shooting rockets all over the place".
"The fire roughnecks who enjoy playing with fire, will die in fire", the news agency said.
It also bans all textile exports and prohibits any country from authorising new work permits for North Korean workers - two key sources of hard currency for the northeast Asian nation.
That resolution imposed a ban on condensates and natural gas liquids, a cap of 2 million barrels a year on refined petroleum products and a cap on crude oil exports to North Korea at current levels. "We have developed strong allies and strong alliances internationally".
Elleman said the missile of choice in a North Korean atmospheric H-bomb test likely would be its longest-range ballistic missile, known as the Hwasong-14, which apparently has the capability of reaching the USA mainland, or the intermediate-range Hwasong-12.
A ban on textile imports from the North will go into effect immediately, the statement said.
Feds notify 21 states of election hacking
Washington state uses the updated software and "best practices and security measures" to try to ensure honest elections, she said. Wisconsin election officials have repeatedly said there were no indications that state elections were tampered with past year .