Also the epicenter was around where an artificial quake occurred on September 3, where North Korea conducted its sixth and most powerful nuclear test.
Secretary of State Rex Tillerson declined to say how exactly the USA might act if North Korea drops a hydrogen bomb in the Pacific.
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.
Pyongyang later said it had tested a hydrogen bomb that could be fitted onto a missile - an assertion that no foreign government has so far confirmed. It comes a day after US President Donald Trump signed an executive order to add more sanctions to North Korea.
MailOnline quoted China's official Xinhua News Agency as saying that the quake may have been a "suspected explosion". India has said that it "deplores" North Korea's latest nuclear test, calling it a "matter of deep concern that DPRK [Democratic People's Republic of Korea] has once again acted in violation of its global commitments".More news: Iran tests new missile despite USA warnings
All 15 members of the Council, including China and Russian Federation, approved the sanctions, which also make it illegal for foreign firms to conclude commercial agreements with North Korean organisations. "We can not conclusively confirm at this time the nature (natural or human-made) of the event".
North Korea depends on China for nearly all its oil and gas but estimates of its consumption are low, leaving it unclear how Beijing's new limit will affect them.
Seismic activity was detected Saturday near the site of North Korea's Punggye-ri nuclear site, but it is not known whether a nuclear test caused the development.
The forceful rhetoric from Pyongyang came after Trump threatened to "totally destroy" North Korea in a speech Tuesday to the General Assembly.
The US has accused Beijing of not doing enough to pressure Pyongyang into abandoning its nuclear program. The larger one had a 3.4 magnitude, the group's initial assessment found, which is much smaller than anything declared as a nuclear test in previous years.
"It also allows us to freeze assets of actors supporting North Korea's textiles, fishing, IT and manufacturing industries", Mnuchin said.More news: Kylie Jenner Is Reportedly Pregnant. With A Baby
China accounts for about 90 percent of North Korea's foreign trade.
China yesterday said it will ban exports of some petroleum products to North Korea, as well as imports of textiles from the isolated North, in line with a United Nations Security Council resolution passed after Pyongyang's latest nuclear test.
An attack on North Korea now would undercut the recent decision by China to suspend financial transactions with the North and ban oil exports and textile imports.
Unwilling to completely pull the plug, it has nevertheless agreed to a stiff package of sanctions at the United Nations, and implemented them with unprecedented determination, experts say.
"This mission is a demonstration of USA resolve and a clear message that the president has many military options to defeat any threat", Ms White said.
While addressing UN General Assembly, President Trump threatened to "totally destroy" North Korea if forced to do so in defence of the USA or its allies.More news: Mexico City Shaken By 7.1 Magnitude Quake
North Korea has one nuclear test site - Punggye-ri.