I asked and it turns out nuclear explosions don't register in #LIGO
On 6 January 2016 at 10:00:01 UTC+08:30 North Korea set off a nuclear device.
Did this event register in your data in any way?
Thanks for your very interesting question.
Indeed, this event (and all events involving rapidly-changing distributions of mass and energy) will produce gravitational waves. However, it is straightforward to calculate that the GWs from this event are many, many, many times weaker than anything LIGO could possibly detect.
However, this event also caused ordinary seismic waves (violent ground motion), which was picked up by seismometers around the world:http://earthquake.usgs.gov/earthquakes/eventpage/us10004bnm#general_region
Whereas GWs travel at the speed of light (30,000 km/s), seismic waves travel much slower (a few km/s, depending on the type of wave). They probably arrived at our Hanford detector 38 minutes later and our Livingston detector 52 minutes later. However, our seismometers did not register anything significant at that time, and our detectors were not in observing mode at that time.
I hope this helps.
Alan Weinstein for LOSC