A 3.4 magnitude quake has occurred in the northeastern part of North Korea, data published by the China natural disaster Networks Center (CENC) has said.
The agency said it is analyzing the nature of the quake. He told lawmakers Thursday that now people can do little more than get inside because a missile strike could occur with less than 20 minutes' warning.
"All of our endeavors are to prevent war from breaking out and maintain peace", Moon said in his speech.
The state has plans to reintroduce monthly tests of an attack-warning siren.
The EU agreed today on new sanctions against North Korea, diplomatic sources said, as the global community steps up efforts to punish the pariah state for its nuclear weapons programme.
Resisting intensifying worldwide pressure, Pyongyang conducted its sixth and largest nuclear test on September 3 and has launched several missiles this year, including two intercontinental ballistic missiles.
China's foreign minister Wang Yi called on North Korea not to go further in a "dangerous direction" with its nuclear program.
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More than 300 people have been reported killed in Tuesday's quake; almost 100 reportedly died in the September 8 temblor. He said that two people had died from heart attacks - local media said the victims were women aged 58 and 83.
Ministry spokesman Baik Tae-hyun says North Korea should stop provocations that would "lead to its own isolation and demise".
The event follows a turbulent week between the USA and North Korea, with leaders Donald Trump and Kim Jong Un trading insults. Kim responded in a statement, calling Trump a "mentally deranged US dotard" and said "a frightened dog barks louder".
It added that China has issued a "comprehensive ban on imported textiles" from North Korea, reiterating another clause of the new sanctions that prohibits trade in both fabric and clothing.
"No bank in any country should be used to facilitate Kim Jong-un's destructive behavior", Mnuchin told reporters.
After its two successful intercontinental ballistic missile tests in July, North Korea in early August had threatened to strike Guam in response to US President Donald Trump's rhetoric that any threat by Pyongyang would be "met with fire and fury like the world has never seen".
Such a test would be considered a major provocation by Washington and its allies.