Accuracy and Correctness Assessment of Geomorphologic Indices by Geodynamic Data (Case Study: Jajroud Catchment Basin, NW Tehran)

Earth is a dynamic system that changes and evolutions are among its adherent characteristics (Ramesht & et al., 2002: 30). Almost during of a few recent thousand years, any regions on the earth’s surface are affected byneo-tectonic activities. In fact, today neo-tectonic is changing the earth's surface (Wallace, 1977). Neo-tectonic activity deals with studying the active processes and effective dynamic that are building the earth and landscapes (Keller and Pinnter, 2002: 80). Therefore, using geomorphologic indices of neotectonic activities, studying tectonic activities will be accomplish within a short time and also are usable for more accurate researches in the future. Geomorphologic indices are useful tools for assessment of neo-tectonic activities, because of using these indices, identify the areas, with fast or slow neo-tectonic activities in the past (Ramirez and Herrera, 1998: 317). These indicators are used for studying the active tectonics particularly. Geomorphologic indicators in the study of neo-tectonic activities was used by Bull and McFadden (1977) for first time and followed by other researchers such as Rockwell et al (1985); Wells et al.(1988); Silva et al (2003); Guarnieri& Pirrotta (2008). In Iran, Khayam and Mokhtari (2003); Madady & et al(2003); Vahdati Daneshmand & et al (2005); Gorabi and Nohegar (2006); Yamani et al (2007); Maghsodi and Kamrani (2007); Karami (2008); Bayati Khatibi (2008); Rameshat et al (2008); Roustaei et al (2008); Seif and Khosravi (2009) used these indices for determining the neo-tectonic activities. Major or minor active fault systems, several alluvial terraces in the margin of Jajroud River and its sub- branches, waterfalls, widening or narrowing bed channels, changing in flood channel and longitude and width of river profiles indicate that neo-tectonic is active in these regions. Thus, due to the importance of fully evaluating the tectonic activities, especially the young and contemporary tectonic movements and their hazards such as non equilibrium slopes, the present study was designed to determine the neo-tectonic activities in Jajroud Basin in the NE Tehran province (Iran). Further, has been tried for innovating in the methodology, judge about the neotectonic activities in their case study area based on results of calculating and measuring these indices and geodynamic data.