Initial reports of a 5.1 magnitude earthquake detected in North Korea from the USGS

Reuters with more:

  • China earthquake networks center says North Korea earthquake suspected to be explosion

... that's via Yonhap (South Korean news)

More from Reuters:

  • Location of earthquake detected in North Korea within 30 km of known North Korea nuclear test site, based on USGS coordinates
  • South Korean Met. agency says North Korea earthquake appears to be man-made
  • South Korean Met. agency says North Korea earthquake took place 49km from known nuclear test site

And:

  • South Korean authorities suspected to have sold dollars to curb won's fall after North Korea earthquake - traders

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More (Reuters again):

  • Earthquake depth 10km below surface