Tensions between the United States and North Korea have ratcheted up after the sixth and most powerful nuclear test conducted by Pyongyang on September 3 prompted the United Nations Security Council to impose further sanctions last week.
The North conducted its sixth and most powerful nuclear test on September 3 in what it said was the detonation of a thermonuclear weapon built for its developmental Hwasong-14 ICBMs.
This test, the most powerful ever conducted by North Korea, had caused an natural disaster of magnitude 6,3 felt up in China. A South Korean expert said the quake could have been caused by geological stress created from the recent nuclear explosion.
He threatened the "highest level of hard-line countermeasure in history" and called the American president a "mentally deranged US dotard".
The seismic activity came just hours before North Korea's Foreign Minister Ri Yong Ho, who warned on Thursday that North Korea could consider a hydrogen bomb test of an unprecedented scale over the Pacific, was due to address the United Nations General Assembly in NY.
Others, however, have questioned whether a strong response from China - and China joining North Korea's adversaries - could lead to the conclusion desired by the USA and the United Nations: the denuclearization of North Korea.
Reuters added that banks were "told to stop providing financial services to new North Korean customers and to wind down loans with existing customers".
While addressing UN General Assembly, President Trump threatened to "totally destroy" North Korea if forced to do so in defence of the United States or its allies.
North Korea's weakest nuclear test, its first one, conducted in 2006, generated a magnitude 4.3 quake.
Chinese banks received the document on Monday, the sources said.
Previous earthquakes in North Korea have indicated nuclear tests by the nation, which is at loggerheads with the U.S. and the rest of the global community over its weapon development.
North Korean media on Friday issued a statement in response to recent comments by President Trump that the US could "totally destroy" the DPRK if the situation required it. China agreed to the measure after the United States tempered its initial suggestion of a total oil embargo.
While the impact of previous tests hasn't been fully understood, damage from radioactive fallout could be serious.
Kim Dong-yub, a former South Korean military official who is now an analyst at Seoul's Institute for Far Eastern Studies, said it's more likely that the North's next significant launch would be a full-range test of an unarmed Hwasong-14 ICBM.
Isolating the rogue regime relies heavily on China, as the nation has historically been a major trading partner with North Korea and has contributed greatly to North Korea's energy production.
"Together with Donald, we've been successfully demonstrating our strong will to exercise pressure against North Korea, and that actually led to the unification of the global community to address this challenge", he said. However, a limited amount sanctioned under United Nations resolution, would still be exported to North Korea.
"And I think the initiative stand with the United States and South Korea to lessen the tensions by opening up a channel for a negotiation process".
"The Administration's strong stance and tough negotiating has resulted in a global effort to reduce North Korea's access to financing and products".