Active Tectonic Survey of Northwest Zagros By Using River Drainage Network Analysis, Geomorphic Indices, and GPS Data

Asemanabad river basin is located in northwest zagros mountain and in south of Kermanshah province and in west of Iran. Being young zagros geomorphologic landforms and studied district is result of continuing neotectonic movements in quaternary era. The goal of this research is tectonic evaluating of district active by using Asemanabad river drainage network analysis and comparing achieved results of geomorphic indices¡ geomorphologic documents and GPS data. Asemanabad River has mixed load and kind of (3B) and me Andric design as sinus shape in which width of river becomes wider in meanders. In this research several landforms field visits¡ geomorphologic indices (SL¡ AF¡ P¡ S)¡ topographic plans 1:50000 geological plans 1:100000 and aerial photos 1:55000 ¡ IRS satellite image 2002 in district¡ GPS data and ARC GIS 9.3 software¡ Envi 4.3¡ Corel drew x4 as research tool for analyzing district active tectonic has been used. The achieved results certify active tectonic movements as high appearance and shortage in quaternary and in northwest zagros and studied field. Layer traces¡ vertical wall influenced on river bed¡ cut meander¡ widening and interrupting river and High compression ratio are geomorphologic documents of tectonic effect on Asemanabad River.