Coincidence? Mag 5.4 - 8km S of Kyonju, South Korea just 3 days after N Korea detonate a nuke causing a mag 5.3 quake.
It has been recorded at a depth of 10km by USGS so it could be a natural quake, however just three days after N Korea tested a nuclear device causing a mag 5.3 quake, S Korea just happens on a mag 5.4 retaliation quake!
The quake has also occurred in an area not common for quakes.
North Korea is believed to have conducted a fifth nuclear test, its most powerful to date, South Korea's military said on Friday after monitors detected a 5.3-magnitude "artificial earthquake" near its main nuclear site.
A mag 6.0 - 51km N of Moyobamba, Peru: Earthquakes in diverse places-mag 5.9 kills at least 13 in Tanzania