Interpreting the geomorphometric indices for neotectonic implications: An example of Alaknanda valley, Garhwal Himalaya, India

Journal of Earth system science

Naresh Rana1 2¹  Y P Sundriyal1¹  Sunil Singh1¹  G S Rawat1¹  Navin Juyal3² 

[1]Department of Geology, HNB Garhwal University, Srinagar Garhwal, India$$

[2]Physical Research Laboratory, Navrangpura, Ahmedabad, India.$$

关键词: Geomorphometry;    uplift;    tectonics;    ASTER;    Alaknanda valley;    Garhwal Himalaya;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Tectonic process can influence the erosion and exert the first order impression on hydrographic networkof an area. Geomorphometry, a mathematical analysis of the configuration of the landforms, allows quantifyingthe degree of landform evolution and is widely used as a measure of tectonic deformation/uplift.Alaknanda valley lies in the tectonically active Garhwal Himalaya which has experienced two disastrouslarge earthquakes in the last two decades. Morphometric analyses of the valley were carried out in a fluvialerosion dominated regime and the morphometric indices were derived from the ASTER (30 m × 30 mpixel) Digital Elevation Model (DEM) using Arc GIS. The results of the analyses reveal two zones ofhigh deformation/uplift in the valley, viz., the zone of high deformation proximal to the Main CentralThrust (MCT) in the Inner Lesser Himalaya (ILH) and the second zone of moderate deformation/upliftin the Outer Lesser Himalaya (OLH), south of the Tons Thrust (TT). The high deformation in the ILHis ascribed to the focussed convergence and high precipitation; however, the causes for the moderatedeformation in the OLH are yet to be established.

【 授权许可】

Unknown