The Korea Meteorological Administration (KMA) put the second tremor higher than USGS, at 5.8-magnitude, describing it as the "biggest ever". "It was the biggest quake ever to hit the country," Yoo Yong-Gyu, a KMA official, told reporters, adding the tremor was "felt all across the country". Monday’s second quake hit at around 8:30 pm (1130 GMT), with the epicentre near the southeastern city of Gyeongju, the KMA said. On Friday USGS reported a 5.3-magnitude "artificial earthquake" in North Korea, that was in fact a nuclear test. Local nuclear reactors were operating without disruption, it said, citing officials at Korea Hydro & Nuclear Power.

Source: The Nation Bangkok September 12, 2016 13:30 UTC