The 15-member council including China, Pyongyang's ally, "strongly condemned" the test and described it as a "clear threat to international peace and security."
Uruguay's Ambassador Elbio Rosselli, this month's council president, recalled that the council had threatened to take "further significant measures" if Pyongyang violated UN resolutions by testing an atomic device.
"In line with this commitment and the gravity of this violation, the members of the Security Council will begin to work immediately on such measures in a new Security Council resolution," said Rosselli.
North Korea said it had carried out a "successful" miniaturised hydrogen bomb test -- a shock announcement that, if confirmed, would massively raise the stakes in the hermit state's bid to strengthen its nuclear arsenal.
UN Secretary-General Ban Ki-moon called the underground nuclear test "deeply troubling" and "profoundly destabilizing for regional security."
He stressed that it was in violation of numerous Security Council resolutions barring Pyongyang from engaging in nuclear activities.
Currently there are a total of 20 entities and 12 individuals on the UN sanctions blacklist.
British Ambassador Matthew Rycroft said his delegation was "working with others on a resolution on further sanctions.
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