Alcay, Salih2024-02-232024-02-2320161214-9705https://doi.org/10.13168/AGG.2016.0007https://hdl.handle.net/20.500.12452/14692This paper investigates the pre-earthquake ionospheric variations using Total Electron Content (TEC) of Precise Point Positioning (PPP) based regional ionospheric maps and Global Ionospheric Maps (GIMs) during the 7.2 Mw Van earthquake which occurred on October 23, 2011. TEC Maps around the epicenter from 10 days before to 4 days after the earthquake were examined. In addition, time series of the TEC values were evaluated and results showed that the ionospheric TEC was increased obviously 3 days before and 2 days after the earthquake. These variations of the TEC were possibly associated with the seismic activity and geomagnetic storm respectively.eninfo:eu-repo/semantics/openAccessEarthquakeIonosphereGlobal Ionosphere Map (Gim)Precise Point Positioning (Ppp)Seismo-Ionospheric AnomalyTotal Electron Content (Tec)Article1332572622-s2.0-84988524935Q3WOS:000384272300004Q310.13168/AGG.2016.0007