"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity

Abstract

Abstract. This paper is related to the study of the ion density recorded by the low altitude satellite DEMETER. In a first time there is an automatic search for ionospheric perturbations in the complete satellite data set of ion densities. Then perturbations due to known ionospheric phenomena (for example, solar activity) are eliminated as well as perturbations not above a seismic zone. In a second time, there is a search to know if each selected perturbation corresponds to a future earthquake. The earthquakes have been classified depending on their magnitude and depth. This attempt to predict earthquakes of course generates false alarms and wrong detections. The results of this statistical analysis are presented as function of various parameters. It is shown that the number of false alarms is very important, because the ionosphere has variations not only linked to the seismic activity. The number of wrong detections is also important and can be explained by the fact that the satellite is above a seismic area only a few minutes per day and we do not expect continuous perturbations from a given earthquake. The more important results of this study is that the ratio between detected earthquakes and earthquakes to be detected increases with the magnitude of the earthquakes which intuitively makes sense.

Statistical Study on Variations of the Ionospheric Ion Density Observed by DEMETER and Related to Seismic Activities

“…This increase depends on M and on the depth of the earthquakes. Statistical analyses have been performed using the automatically determined ion density peaks in the complete DEMETER data set (6.5 years) (Li & Parrot, , ; Parrot, , ). The occurrence of the peaks (time and position) is then compared to the occurrence of earthquakes.…”

A qualitative study of seismic-ionospheric precursor phenomena monitored by a very close to the epicenter VLF and LF receiver

“…A great amount of research in the last twenty years by means of ground-based experiments Contadakis et al, 2007Contadakis et al, , 2008Contadakis et al, , 2011Contadakis et al, , 2012Hayakawa, 2011;Hayakawa et al, 2011;Liperovsky et al, 2005;Molchanov et al, 2005;Righetti et al, 2012;Rozhnoi et al, 2004Rozhnoi et al, , 2009Shvets et al, 2004;Skeberis et al, 2012;Xenos, 2009, 2010;Umarkhodgaev et al, 2012), space-born studies (Boudjada et al, 2008;Hayakawa et al, 2000;Li et al, 2012;Molchanov et al, 2006;Nemec et al, 2009;Parrot et al, 2006;Stangl et al, 2011) and combined spaceborn and ground-based studies (Muto et al, 2008;Rozhnoi et al, 2007) as well, indicate the existence of pre-, co-and post-earthquake disturbances at all the ionospheric layer levels (D, E and F layers).…”

The Langmuir Probe Onboard CSES: data inversion analysis method and first results

“…From its records, many ionospheric plasma perturbations related to seismic events have been detected (Sarkar et al, , ; Zhang XM et al, , b; Liu J et al, ). Furthermore, statistical analysis of plasma parameters has been developed to ascertain the relationships between ionospheric perturbations and large earthquakes (He Y et al, , ; Parrot, ; Píša et al, ; Li M and Parrot, ; Yan R et al, ).…”