Earth quake considerations with ionosphere F2 layer plasma charged density variation

Ionosphere is a part of earth’s atmosphere plasma constituted from 80 km above the earth surface with different electron densities and layered shape including D, E, F1 and F2 downside up respectively. Ionosphere plasma disturbances originated from some natural phenomena like earth quake that is studied from 1964 by satellite with plasma layers parameters like critical frequency and or electron density of the medium. In this research we obtained critical frequency of the F2 layer from SWPC station from which we calculated the electron density of the plasma these calculations ranging a few days before sever earth quakes occurrence in magnitudes something around 9 in Richter scale to a few days after earth quakes ending. The selected site for both plasma considerations & earth quake occurrences is Tokyo Japan. The special attention paid on the march 11,2011 Tokyo earth quake with a magnitude about 9 in Richter scale and the data obtained showed an Increased in electron density of the F2 layer plasma; This method used for several earth quakes occurred in Tokyo; with sever magnitude in Richter scale together with the plasma density that is increased based upon the SWPC station of the F2 layer in this place.