| Summary: Due to the unpredictable nature of the earthquakes, it has brought with it the greatest natural disasters since the early ages. Since earthquakes are seismic activities, so before the occurrence of seismic activity, various precursors were occured. It is thought that an effect of seismic activity is also on the ionosphere layer. For this reason, possible seismic activity is tried to identify by observations of changes on the ionosphere. One of the most important ingredients in these studies is the variation of the ionospheric TEC value. Within the scope of the thesis, ionospheric TEC changes were calculated taking into account the space weather condition indices and IGS stations GPS data which were located in the equatorial and mid latitude regions after 2000. The pre earthquake ionospheric TEC anomalies were investigated according to the magnitude of earthquakes, depth of focus and geo tectonic structures. Thus, it was determined how earthquakes affected ionospheric TEC changes in the equatorial and mid latitudes. In addition, the relationship between earthquake parameters and geo tectonic structure of ionospheric TEC changes has been presented. It is believed that the results of the study will contribute to the Lithosphere Atmosphere Ionospheric Coupling (LAIC) Model. In the LAIC Model, consideration of ionospheric TEC anomalies for earthquakes that occur in different geo tectonic structures is expected to contribute to ionospheric earthquake prediction studies.
Key Words: Ionospheric TEC Anomalies, Space Weather Conditions, Earthquake, GPS, Solar Activity, Geomagnetic Activity |
