A magnitude 3.5 earthquake struck at 4:29 a.m. ET Saturday 22 kilometers (more than 13 miles) east-northeast of Sungjibaegam, North Korea, the US Geological Survey said. The depth of the earthquake was 5 kilometers (3.1 miles).
“This event occurred in the area of the previous North Korean nuclear tests,” the USGS said. “We cannot conclusively confirm at this time the nature (natural or human-made) of the event.”
The analysis indicated neither one was man-made, meaning they don’t appear to be explosions. The locations are around 50 kilometers away (more than 30 miles) from the site of previous nuclear tests, the group said.
Two South Korean officials at the Korea Meteorological Administration told CNN that their analysis so far suggests Saturday’s seismic activity around the nuclear site was not caused by an explosion or a collapse of the site.
“We assess that there is a slim possibility that it was caused by a …