Evidences of Active Deformation in the Northwestern Part of Almora, in Kumaun Lesser Himalaya: A Geomorphic Perspective

The Geomorphic structures in the North Almora Thrust zone (NATZ) have been analyzed to understand active deformation in the North Almora Thrust zone (NATZ). The NAT is an active structure of Kumaun Lesser Himalaya, extending west from Kali valley to Ramganga valley. The present study is taken up with the help of Toposheet Digital Elevation Modelling (DEM) and field observations. The NNW-SSE trending tectonic features such as the Ramganga River Fault, NW-SE Gagas River Fault and NNW-SSE Saryu River Fault are active structures in this region. The Morphometric analysis has been carried out using survey of India Topsheet (1 50 000). The longitudinal valley profile shows steep slope along the knick points showing high Gradient Index (GI) value. The steep slope along knick points could be probably due to movement along faults/thrust passing through the area. Geomorphic features related to active tectonic e.g. uplifted terraces, wide and straight river course abrupt termination of broad river valley into narrow gorges and laulting in the unconsolidated sediment. These landforms suggesting the area between Someshwar Lodh-Gagas is active and rejuvenating in recent time.