Rolland L. M. auteur aut IRD Vergnolle M. auteur aut IRD Nocquet Jean-Mathieu auteur aut IRD Sladen A. auteur aut IRD Dessa J. X. auteur aut IRD Tavakoli F. auteur aut IRD Nankali H. R. auteur aut IRD Cappa F. auteur aut IRD text journalArticle eng text/pdf born digital access It has previously been suggested that ionospheric perturbations triggered by large dip-slip earthquakes might offer additional source parameter information compared to the information gathered from land observations. Based on 3D modeling of GPS- and GLONASS-derived total electron content signals recorded during the 2011 Van earthquake (thrust, intra-plate event, M-w=7.1, Turkey), we confirm that coseismic ionospheric signals do contain important information about the earthquake source, namely its slip mode. Moreover, we show that part of the ionospheric signal (initial polarity and amplitude distribution) is not related to the earthquake source, but is instead controlled by the geomagnetic field and the geometry of the Global Navigation Satellite System satellites constellation. Ignoring these non-tectonic effects would lead to an incorrect description of the earthquake source. Thus, our work emphasizes the added caution that should be used when analyzing ionospheric signals for earthquake source studies. specialized earthquake source monitoring GNSS (GPS and GLONASS) ionosphere modeling TURQUIE 064 020 40 11 2518-2522 2013 0094-8276 https://www.documentation.ird.fr/hor/fdi:010060530 10.1002/grl.50544 0094-8276 [F B010060530] https://www.documentation.ird.fr/hor/fdi:010060530 https://www.documentation.ird.fr/intranet/publi/2013/08/010060530.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-09-03 2017-08-23 fdi:010060530 fre