Using the US Geological Survey to track earthquakes, I found 3 epicentres of close proximity of one another within 7 years. This was in a small area inside North Korea. I would not assume this to be an earthquake of any kind. But rather, something completely artificial. So with the data included below this post, I presumed that this could only be the result of several systematic underground nuclear tests. But I will only focus on the largest and most recent nuclear explosion.