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Turkey is a country located in the middle latitude zone, where tectonicactivity is intensive. Recently, an earthquake of magnitude6.5  <i>M</i><sub>w</sub> occurred offshore in the Aegean Sea on 24 May 2014 at 09:25 UTC, which lasted about 40 s. The earthquake was also felt in Greece,Romania, and Bulgaria in addition to Turkey.  In recent years, ionospheric anomaly detection studies have been carried outbecause of seismicity with total electron content (TEC) computed from theglobal navigation satellite system's (GNSS) signal delays and severalinteresting findings have been published. In this study, both TEC andpositional variations have been examined separately following a moderate sizeearthquake in the Aegean Sea. The correlation of the aforementionedionospheric variation with the positional variation has also beeninvestigated. For this purpose, a total of 15 stations was used, includingfour continuously operating reference stations in Turkey (CORS-TR) andstations in the seismic zone (AYVL, CANA, IPSA, and YENC), as well asinternational GNSS service (IGS) and European reference frame permanentnetwork (EPN) stations. The ionospheric and positional variations of theAYVL, CANA, IPSA, and YENC stations were examined using Bernese v5.0 software.When the precise point positioning TEC (PPP-TEC) valueswere examined, it was observed that the TEC values were approximately 4 TECU(total electron content unit) above the upper-limit TEC value at fourstations located in Turkey, 3 days before the earthquake at 08:00 and10:00 UTC. At the same stations, on the day before the earthquake at 06:00,08:00, and 10:00 UTC, the TEC values were approximately 5 TECU below thelower-limit TEC value. The global ionosphere model TEC(GIM-TEC) values published by the Centre for Orbit Determination in Europe(CODE) were also examined. Three days before the earthquake, at all stations,it was observed that the TEC values in the time period between 08:00 and10:00 UTC were approximately 2 TECU above the upper-limit TEC value; 1 daybefore the earthquake at 06:00, 08:00, and 10:00 UTC, the TEC values wereapproximately 4 TECU below the lower-limit TEC value.  Again, by using the same 15 stations, positional variation investigation forbefore and after the earthquake was undertaken for the AYVL, CANA, IPSA, andYENC stations. As a result of the conducted analysis, positionaldisplacements were seen before and after the earthquake at the CANA station,which is the nearest station to the earthquake centre. Before and after theearthquake, positional displacements were observed as 10 and 3 cmrespectively

natural hazards and earth system sciences

Review of variations in &amp;lt;i&amp;gt;M&amp;lt;/i&amp;gt;&amp;lt;sub&amp;gt;w&amp;lt;/sub&amp;gt; &amp;lt; 7 earthquake motions on position and TEC (&amp;lt;i&amp;gt;M&amp;lt;/i&amp;gt;&amp;lt;sub&amp;gt;w&amp;lt;/sub&amp;gt; = 6.5 Aegean Sea earthquake sample)