South Korean leader urges North Korea to abandon weapons and pursue dialogue

For reference, the US agency recorded a 6.3 magnitude quake after North Korea's hydrogen bomb test on September 3, its sixth of a nuclear weapon.

In a statement on its website, China's natural disaster administration said the quake was recorded at a depth of zero kilometers and described it as a "suspected explosion". They believe the activity was the result of a natural quake. 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. The president's office did add that "analysis is still ongoing so we will keep you posted".

However, the agency has said it has not detected any man-made sound waves and the initial view was that it was a natural tremor.

It said that it was thought to be an artificial quake caused by a "suspected explosion". She spoke on condition of anonymity, citing office rules.

Park said analysts could not rule out the possibility that a natural quake occurred because of a nuclear test.

The last time South Korea provided humanitarian aid to North Korea through an global agency was in December 2015, when it gave $800,000 to the UN Population Fund project to evaluate North Korean public health conditions. -Russian relations are at a low point, but Tillerson recalled the cooperation between Washington and Moscow during the Soviet era, despite their Cold War rivalry, on measures to stop the threat of nuclear weapons proliferation. The latest test was followed by a second magnitude 4.1 quake that experts said could have been caused by landslides or a tunnel collapsing after the explosion.

China warned on Friday that the situation on the Korean Peninsula was "grave" and called for restraint on all sides after North Korea hinted that it might explode a hydrogen bomb over the Pacific Ocean.

"Iran and North Korea are interconnected today, because if the United States quits the JCPOA [the Joint Comprehensive Plan of Action], it will be the wrongest signal possible that we can ever send to North Korea", he said.

The Stockholm International Peace Research Institute says developments in North Korea's nuclear program "contributed to international political instability with potentially serious knock-on effects". This means taking into account all factors that affect security - "first and foremost" the USA deployment of the Terminal High-Altitude Area Defense System, also known as THAAD, and "NATO's joint nuclear mission".