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Before this earthquake, water resources were monitored in the areas of Bayraklı, Gülbahçe, and Seferihisar. For this purpose, 10 groundwater monitoring wells were drilled in the Bayraklı area, where groundwater level, temperature, and electrical conductivity changes were monitored at 1-h intervals in 5 wells. Besides physical parameters such as groundwater levels, temperatures and electrical conductivities, hydrogeochemical cations, and anions measured in the study area. Change in the groundwater levels was observed before, during, and after the Samos earthquake. A trend of rising groundwater level was observed two days before the mainshock, to a height of 10 cm, and the level was maintained till the end of the earthquake. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 758-778 http journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 yer-2101-9 Effects of seismic activity on groundwater level and geothermal systems in İzmir Western Anatolia Turkey the case study from October 30 2020 Samos Earthquake 1 2 2 2 3 4 Taygun UZELLİ Esra BİLGİÇ Bahadır ÖZTÜRK Alper BABA Hasan SÖZBİLİR Orhan TATAR 1 İzmir Institute of Technology Geothermal Energy Research and Application Center İzmir Turkey 2 İzmir Institute of Technology Engineering Faculty Department of International Water Resources İzmir Turkey 3 Dokuz Eylül University Earthquake Research and Application Center İzmir Turkey 4 Department of Geological Engineering Faculty of Engineering Sivas Cumhuriyet University Sivas Turkey Received 12.01.2021 Accepted Published Online 14.09.2021 Final Version 30.10.2021 Abstract The October 30 2020 Samos earthquake Mw 6.6 affected the Aegean Sea and environs caused destruction and loss of life in the city of İzmir located 70 km away from the earthquake epicenter. Before this earthquake water resources were monitored in the areas of Bayraklı Gülbahçe and Seferihisar. For this purpose 10 groundwater monitoring wells were drilled in the Bayraklı area where groundwater level temperature and electrical conductivity changes were monitored at 1-h intervals in 5 wells. Besides physical parameters such as groundwater levels temperatures and electrical conductivities hydrogeochemical cations and anions measured in the study area. Change in the groundwater levels was observed before during and after the Samos earthquake. A trend of rising groundwater level was observed two days before the mainshock to a height of 10 cm and the level was maintained till the end of the earthquake. The water levels returned to its original height after about 7 to 10 days of the earthquake. Moreover electrical conductivity EC values were changed because of the interaction with the surrounding rocks and .