DETECTED SEISMO-IONOSPHERIC ANOMALIES BEFORE STRONG EARTHQUAKES (M>6.0) USING DEMETER AND GPS DATA

We have statistically analyzed the variations of the electron and ion densities to search for disturbances in the vicinity of Samoa earthquake prior to event using IAP (plasma analyzer) and ISL (Langmuir probe) experiments onboard DEMETER (Detection of Electromagnetic Emissions Transmitted from Earthquake Regions) satellite and GPS (Global Positioning System) measurements. The indices Dst and Kp were used to distinguish pre-earthquake anomalies from the other anomalies related to the geomagnetic activities. For studied case, a very good agreement was found between the different parameters estimated by DEMETER and GPS data in the detection of pre-seismic anomalies. The appearance of positive anomalies in both of DEMETER and TEC (Total Electron Content) data during 1 to 5 days before studied earthquake during quiet geomagnetic conditions indicates that these anomalous behaviors are highly regarded as seismo-ionospheric precursors.

کلیدواژه ها:

Earthquake ، Demeter ، Gps