On 9 October 2006 North Korea announced that it had conducted a nuclear weapons test, its first, at the Chik-tong test site in north Hamgyeong Province. It had been more than eight years since the world's last known nuclear test, carried out by Pakistan on 30 May 1998 (Wallace 1998). The North Korean event was small (4.2 mb) and occurred in a part of the world with a relatively low density of accessible (open) broadband seismometers. Therefore, it provides a nice test of the nuclear explosion monitoring capability of the open global seismic network, which is...

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