Earthquakes can affect how the electromagnetic waves propagate. Wave propagation in the VLF (Very Low Frequency (3-30 kHz)) band has higher permeability and less loss in the atmosphere layers. The ionosphere range consists of neutral particles that are affected by the Earth's magnetic field and the sun's radiation, which are transformed into electron and ion particles, creating a cloud plasma. Consequently, if the ionosphere density changes, the VLF signal amplitude passing through that range also changes. On the other hand, at some point during an earthquake, some of the radon gas is released from the surface into the atmosphere and, if it penetrates to high altitudes, causes a series of oscillations in the upper atmosphere and changes the density of the superclusters. Therefore, it can be used as an earthquake prognosis and prediction of the earthquake due to the relation between radon gas diffusion and ionospheric layer cloud density change and signal amplitude changes