New 4.6 quake detected in N. Korea due to 'cave in'
Beijing : A second earthquake due to a "cave in" has been detected near North Korea's nuclear test site, the China Earthquake Network Center said Sunday, minutes after a major explosion recorded by US experts indicated a sixth atomic test.
The new 4.6 magnitude quake at a depth of zero kilometers could be due to a "collapse (cave in)" Chinese authorities said, without giving further details.
The first "explosion" -- of 6.3 magnitude according to USGS -- could be a possible sixth nuclear test by Pyongyang, Seoul's military said.
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