Reservoir-Triggered Earthquakes Around the Atatürk Dam (Southeastern Turkey)

Reservoir-triggered seismicity has been observed near dams during construction, impoundment, and cyclic filling in many parts of the earth. In Turkey, number increased substantially over last decade, with Atatürk Dam being largest dam Turkey a total water capacity 48.7 billion m 3 . After construction dam, monitoring network improved. Considering earthquakes above long-term completeness magnitude M C = 3.5, local rate after reservoir. Recently, two damaging w 5.5 5.1 occurred town Samsat Reservoir 2017 2018, respectively. this study, we analyze spatio-temporal evolution its source properties relation to temporal water-level variations stresses resulting from surface loading pore-pressure diffusion. We find that are anti-correlated, which is explained by stabilization effect gravitational induced stress imposed on faults. On other hand, overall effective seismogenic zone decades due diffusion, explaining enhanced background recent years. Additionally, observe progressive decrease Gutenberg-Richter b-value. Our results indicate stressing finally focused region where 2018.