As you’re all abundantly aware, North Korea is back in the news, and so is the President of the United States. It’s a nuclear face-off that no one anywhere wants because there’s a real possibility that thousands of lives, perhaps millions, hang in the balance.
Contrary to what you may think, North Korea’s nuclear threat isn’t what most people should be worried about. It’s actually its artillery and conventional missiles, scattered all around the Korean Peninsula, that are the real threat. Even the sneakiest pre-emptive strike from the US-South Korean military forces couldn’t take all of these out in time for Seoul and parts of Japan to suffer from retaliatory strikes by the DPRK.
Nevertheless, North Korea’s nuclear capabilities are – quite rightly – on the minds of many. Although the threat to the American mainland is still slim, it is fair to say that it's growing by the day – so let’s take a look and see just how much of a danger North Korea’s nuclear capabilities currently are.
A Timeline of Nukes
Before we look at their rocket technology, it’s good to be reminded of how far their nuclear weapons program has come along.
So far, the secretive state has detonated at least five nuclear warheads, all underground. Its most recent – which took place on September 9, 2016 – registered as a 5.3-5.6M seismic event on seismographs around the world.
In fact, aside from satellite observations that track military movements in North Korea, seismic waves are arguably the best way to determine whether or not a subterranean nuclear test has taken place.
The wave patterns generated by nuclear weapons are distinct from that of normal earthquakes or volcanic eruptions. Using these waves, scientists can actually work out roughly how powerful the nuclear weapon was, and even what type of warhead was used.
So far, despite the country’s ambitions to develop a more powerful hydrogen bomb, it looks like they’re still using plutonium to create an implosion-style nuclear weapon. The seismic shock waves of a hydrogen bomb would show up as a 7.0M quake, but so far, the country hasn’t produced a weapon that breaches 6.0M.
The explosive yield of the latest device was around 10 kilotonnes of TNT. Fat Man, the plutonium bomb dropped on Nagasaki at the end of the Second World War, had a yield just over twice that, just as a point of comparison.
Apart from these five confirmed tests, there have been rumors of a possible sixth and seventh, both supposedly tested back in 2010, but the jury remains undecided on those ones. It’s more likely than not that these two closely-spaced detonations were, in reality, a series of natural earthquakes.
In any case, North Korea has developed nuclear weapons, but they’re relatively weak at the moment – relatively being the key word here.