Analysis Neotectonic Activities in Khafr Basin

Ahmad Ansari Lari,Maryam Ansari,Soraya Ansari

doi:10.4236/ojg.2016.66040

Abstract

As Iran is located on one of the two earthquake-prone belts in the world, and existence of faults and earthquakes is normal in Iran tableland. The main reason of earthquake is Neotectonic movements which can be effective in other natural disasters such as range movements. Due to the severe shortage of historical and seismic data and device in different parts of the world, particularly Iran, need for introducing more researchers and planners of Iran to tectonics and active tectonic areas is more visible. This study is an investigation of Neotectonic activities in Khafr basin area, Fars province. To achieve the aims of this study morphometric parameters were used. Investigations showed that severity and role of tectonic activities in different parts of the basin is different, results of geomorphic and tectonic assessments indicate these differences.Stream length-gradient index (SL) on the main stream is inactive and sub streams are semi active, the ratio of the basin (BS) is 2.27, drainage basin asymmetry index (AF) is in semi active class, the ratio of width to depth of Valley (VF) shows 0.78. Indicators mentioned are in class 3 based on Iat classification, that represents tectonic activity in the area is average. Other indicators are indicative of active tectonic in the basin such as drainage density index (D) with high density, river sinuosity (S) 1.25, reverse topography symmetry Factor (T) 0.3.Generally it can be considered as moderately active region in terms of tectonic activities.

Highlights

One of the issues in tectonic geomorphology is Earthquake risk assessment in specific areas through the study ofHow to cite this paper: Lari, A.A., Ansari, M. and Ansari, S. (2016) Analysis Neotectonic Activities in Khafr Basin
The ongoing competition between tectonic processes that tend to create topography surface processes that tend to erode and disintegrate them represents a tectonic geomorphology [2], Neotectonic studies phenomena including all the factors, processes and practices arising from new activities of the Earth and forms created by these activities, by this type of investigation, relatively stable and tectonically inactive regions can be identified
With regard to the value of Stream lengthgradient index (SL) index, main stream is in Class 3 that is tectonic tranquility, sub-streams are in class 2 with the moderate tectonic activity

Summary

Introduction

One of the issues in tectonic geomorphology is Earthquake risk assessment in specific areas through the study ofHow to cite this paper: Lari, A.A., Ansari, M. and Ansari, S. (2016) Analysis Neotectonic Activities in Khafr Basin. The ongoing competition between tectonic processes that tend to create topography surface processes that tend to erode and disintegrate them represents a tectonic geomorphology [2], Neotectonic studies phenomena including all the factors, processes and practices arising from new activities of the Earth (on a geological scale) and forms created by these activities, by this type of investigation, relatively stable and tectonically inactive regions can be identified This relatively new branch of applied geomorphology can be used in solving the problems caused by tectonic geomorphology where landforms of roughness and evolution of landscapes caused by new tectonic activities are discussed [1]. Quantitative and numeric assessment make it possible for geomorphologists to evaluate different landforms truly and tangibly; some tools are introduces for this aim, morphometric indexes are among them

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