Ionospheric turbulence modulation by intense seismic activity as a tool of Earthquake risk mitigation

According to the well-known Lithosphere Ionosphere Coupling (LAIC) mechanism, tectonic activity during the earthquake preparation period produces anomalies at the ground level which propagate upwards in the troposphere as Acoustic or Standing gravity waves. Thus observing the frequency content of the ionospheric turbidity in a well extended area, in space and time, around an earthquake event we will observe a decrease of the higher limit of the turbidity frequency band. In this article we review the repeated observational results of TEC turbulent band upper limit (TBUL) on the occasion of strong earthquakes. Regorus earthquake risk estimation can not be extracted from our result since the characteristics of each event is diferent(i.e Magnitude ,epicentral distance of  the nearest GPS station ect..). Nevertheless continuous monitoring of the TEC (TBUL) fo and the alarming for further investigation by comparing with the TBUL of distant stations and with the results of  seismical monitoring, as well as with the results of other near earth surface precursor methods,  if the  TBUL tend to around 0.001Hz..