Alittle bit confused lol, not hard with technical talk i don't fully understand but is there anything stopping people in re-creating the seismic wave which can cause earthquakes from an explosion etc and re-producing it whenever like without the explosion?Hmmm, explosions cause a characteristic signal in seismometers. That signal can be distinguished from one caused by, say, a mine collapse or the various types of fault motion by analysing whether the initial 'blips' recorded on the seismographs around the world are up or down. I suppose that an impact on the Earth's surface might have a similar signature to an explosion - as long as the impactor hit the ground perpendicularly, such that the seismic waves propagated isotropically. But even if a non-explosive impact did have the same seismic signature as an explosion, I don't know how the amplitudes would compare. I have to add the disclaimer that I'm no seismologist, and I'm only speculating.
I should also clarify that the seismic waves from a nuclear explosion don't cause an earthquake; the seismic waves are an earthquake.
In a sense, ripping apart a nuclear explosion, taking only the seismic wave from it and using that.