Effects of seismic activity on groundwater level and geothermal systems in İzmir, Western Anatolia, Turkey: the case study from October 30, 2020 Samos Earthquake

The October 30, 2020 Samos earthquake (Mw 6.6) affected the Aegean Sea and environs, caused destruction loss of life in city İzmir located 70 km away from epicenter. Before this earthquake, water resources were monitored areas Bayraklı, Gülbahçe, Seferihisar. For purpose, 10 groundwater monitoring wells drilled Bayraklı area, where level, temperature, electrical conductivity changes at 1-h intervals 5 wells. Besides physical parameters such as levels, temperatures conductivities, hydrogeochemical cations, anions measured study area. Change levels was observed before, during, after earthquake. A trend rising level two days before mainshock, to a height cm, maintained till end returned its original about 7 Moreover, (EC) values changed because interaction with surrounding rocks well walls, mixing different waters during shaking. essential anomalies geothermal fields Gülbahçe Due new springs emerged along NE-SW trending Tuzla faults, 50 20 epicenter, respectively. are Na-Cl composition similar other region. While recorded vary 40 45 °C Seferihisar, it between 35 Gülbahçe. these anomalies, is found monitor effect on chemical characteristics usefulness predictions.