Neotectonics of Sepidrud River and Gilan Plain

According to historical maps of Iran, changing the course of Sepidrud from Dastak to Kiyashahr has occurred in a very recent time. Although migration of meandering streams over the delta plain is a natural phenomenon and oscillations of Caspian Sea might have affected the course of Sepidrud River, the deflection of Sepidrud between Astaneh and Koochesfahan is probably related to activity of concealed structures within the delta deposits. This research uses calculation of morphotectonic indexes to study effects of active range boundary within range faults in study area on drainage pattern and river streams