New 4.6-magnitude quake detected in N. Korea due to ‘cave in’: China

This picture taken and released on July 4 by North Korea’s official Korean Central News Agency (KCNA) shows North Korean leader Kim Jong-Un (2nd R) inspecting the test-fire of an intercontinental ballistic missile Hwasong-14 at an undisclosed location.
North Korea declared on July 4 it had successfully tested its first intercontinental ballistic missile — a watershed moment in its push to develop a nuclear weapon capable of hitting the mainland United States. / AFP / KCNA VIA KNS / 

BEIJING, China (AFP) — 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.