Document Type : Original Research Paper

Authors

1 Islamic Azad University, North Tehran Unit, and Geological survey of Iran.

2 Geological Survey of Iran, Research Institute for Earth Sciences, Tehran, Iran

3 Islamic Azad University, North Tehran Branch, and GSI

4 Geological Survey of Iran

Abstract

     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 SepidrudRiver, the deflection of Sepidrud between Astaneh and Koochesfahan is probably related to activity of concealed structures wit
hin 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.

Keywords

References
Annells, R. N., Arthurton, R. A, Bazley, R. A. and Davies, R. G., 1975- Explanatory text of the Qazvin and Rasht Quadrangles Map, 1:250000, Geological Survey of Iran.
Berberian, M., 1983- The southern Caspian: A compressional depression floored by a trapped, modified oceanic crust, Earth Sci., 506- 625.
Berberian, M., Qorashi,M., Jackson,A., Priestley,K. and Wallace,T.,1992- The Rudbar–Tarom Earthquake of 20 June 1990 In NW Persia: Preliminary Field And Seismological Observations, And Its Tectonic Significance,Bulletin of the Seismologic al Society of America, Vol.82,no.4,pp.
IRAN & TURAN ,1872- 1:7/500/000 ، General Mps of Persia 177-1925
Jackson, J., Priestley, K., Allen, M. and Berberian, M., 2002- Active tectonics of the SouthCaspianBasin, Geophys. J. Int., 214- 245.
Kazanci, N., Gulbabazadeh, T., Leroy, S., Ileri, O., 2004 - Sedimentary and environmental characteristics of the Gilan- Mazandaran plain, northern Iran: influence of long- and short- term Caspian water level fluctuation on geomorphology, Jornal of Marine systems, 46 p.145- 168.
Krasnozhon, G. F., Lahijani, H. and Voropayev, V., 1999- Mapping sciences and Remote Sensing, No. 4, pp. 256- 264.
Priestley, K., Baker, C. and Jackson, J., 1994 - Implication of Earthquake focal mechanism data for the active tectonics of the south Caspian Basin and surrounding regions, Geophys. J. Int., 111- 141.