Your question has aready been answered on this forum at Disaster prediction? page.
It is worth noting that after each period of Earth core overheating there was an ice age, caused by volcanic eruptions and emitted high-altitude dust that shielded Earth surface from direct sunshine until it settled down. The last mini-ice-ages were in ~540 AD (a decade called dark ages) and 1815 (a year without summer). Both were caused by a tiny number of volcanic explosions (1 or 2) provoked by overheated Earth interior. See for example this page for explanation of the volcano-climate cooling mechanism.
Each ice age is associated with a distinct layer of dust (of near-identical composition) in rock formations on all continents (ancient ice ages) and/or a layer of dust in ice sheets on both poles (recent ice ages).
When Earth interior overheats not-too-fast, an ice age is a natural way to restore the energy balance of Earth. If Earth interior overheats fast enough for the centre of the core to melt, some isotopes can separate, form a critical mass and the planet may explode, just like planet Phaeton http://thiaoouba.com/phaeton.html
Man-made nuclear explosions are known to stimulate seismic activity, although the exact mechanism is not yet well undestood. The most recent period of violent seismic activity in 1960s coincided with mutiple countries testing their nuclear weapons by means of nuclear explosions.
The last North Korea nuclear test on 3 September 2017 was followed by 8.2 quake in Mexico on 8 September. The delay occurs because heat from the associated "stimulated nuclear decay" in the planetary interior needs time to travel.
Location of the quake provoked by a nuclear test seems to depend on the orientation of the nuclear explosion setup. According to the recent "Science" issue commentary - the Mexico quake location was a total surprise to seismologists... What if the orientation of the nuclear setup can be modified to induce a quake in California or at the White House?
Tom , 26 sept 2017