Inan, S.Yakan, H.Balderer, W.P.Leuenberger-west, F.Özvan, A.Freund, F.T.2025-05-102025-05-1020120016-700210.2343/geochemj.1.01592-s2.0-85024451443https://doi.org/10.2343/geochemj.1.0159https://hdl.handle.net/20.500.14720/4772We performed chemical analyses of commercially bottled spring water (EREK Spring water) emanating from a location less than 20 kilometer from the epicenter of the Mw = 7.2 Van Earthquake of October 23rd 2011. The available water samples cover the period from September 8th 2011 to January 11th 2012. The pre-earthquake anomaly is characterized by a slight but clear increase in Ca2+, Mg2+, K+ and Cl- contents and decrease in Na+ and SO42- contents compared to the background. Post-seismic samples show decreasing trends in Ca2+, Mg2+, K+ and Cl- and increasing trends in Na+ and SO42-. All ion concentrations reach stability approximately one month after the earthquake. These results indicate that spring water chemical anomalies may be monitored as potential geochemical pre-earthquake indicators. © 2012, GEOCHEMICAL SOCIETY OF JAPAN. All rights reserved.eninfo:eu-repo/semantics/openAccessEarthquake PrecursorsGeochemical AnomaliesSpring WaterTurkeyVanArticle461Q4Q3