"The event has earthquake-like characteristics, however, we can not conclusively confirm at this time the nature (natural or human-made) of the event", the USGS said in a brief statement.
It was the latest in a string of aftershocks following North Korea's sixth nuclear test on September 3, which caused a 6.3 magnitude natural disaster, according to the USGS.
The KMA said that it was a naturally-occurring quake with a depth of three kilometers, expecting no damage from the tremor.
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"The depth is poorly constrained and has been held to 5 km by the seismologist". In September, it detonated a hydrogen bomb which caused a 6.3 magnitude quake in the northeast of the country where the Punggye-ri test site is located.
Previous tests had caused stronger quakes, with all of them stronger than 4.3 magnitude.
Later, the Chinese Academy of Sciences and UC Santa Cruz released a joint report that concluded that tunnels in the test site collapsed after the quake.
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"It was the mountain collapsing into the cavity created by the explosion ... hundreds of meters below the surface, " Thorne Lay, a professor at UC Santa Cruz told the US news outlet.
It came three weeks after a 3.5-magnitude natural disaster struck near the same area, with seismic experts and a United Nations nuclear test ban watchdog calling that tremor on September 23 a likely aftershock of the North's sixth and largest nuclear test.
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