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Kothyari, Girish Ch.
- Tectonic Geomorphology of a Part of Bilaspur Region, SW Himachal Pradesh
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Authors
Affiliations
1 Department of Geology, Kumaun University, Nainital - 263 002, Uttaranchal, IN
1 Department of Geology, Kumaun University, Nainital - 263 002, Uttaranchal, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 5 (2007), Pagination: 909-915Abstract
Morphometric parameters such as drainage, sinuosity character, gradient index (GI), Pseudo Hypsometric Integral (PSI), and longitudinal profile of the Satluj River and its tributary the Ali Khad have helped in delineating the NNW-SSE trending Ali Khad fault. Movements along this fault are manifest in the development of unpaired terraces, triangular fault facets, deep gorges and fault breccias. Normal faulting has been observed in the Quaternary sediments which reflect recent movements. Digital Elevation Model is proposed.Keywords
Neotectonics, Digital Elevation Model, Bilaspur, Lesser Himalaya.
- Evidences of Active Deformation in the Northwestern Part of Almora, in Kumaun Lesser Himalaya: A Geomorphic Perspective
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Authors
Affiliations
1 Department of Geology, Kumaun University, Nainital, Uttarakhand, IN
2 Department of Geology, Kumaun University, Nanital, Uttarakhand, IN
1 Department of Geology, Kumaun University, Nainital, Uttarakhand, IN
2 Department of Geology, Kumaun University, Nanital, Uttarakhand, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 3 (2008), Pagination: 353-364Abstract
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.Keywords
Rejuvenation, Active Tectonic, Longitudinal Valley Profile, DEM, Kumaun Himalaya.- Landslides and Neotectonic Activities in the Main Boundary Thrust (MBT) Zone: Southeastern Kumaun, Uttarakhand
Abstract Views :176 |
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Authors
Affiliations
1 Institute of Seismological Research, Raisan - 382 009, IN
2 Department of Geology, Kumaun University, Nainital, IN
3 Wadia Institute of Himalayan Geology, Dehradun, IN
1 Institute of Seismological Research, Raisan - 382 009, IN
2 Department of Geology, Kumaun University, Nainital, IN
3 Wadia Institute of Himalayan Geology, Dehradun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 1 (2012), Pagination: 101-110Abstract
Main Boundary Thrust (MBT) zone is constituted of some of the landslide prone areas in southeastern part of Kumaun Sub-Himalaya. Role of landslides as natural hazard and hill slope modifying agent is well documented from various part of Himalayan region and southern hills of Kumaun particularly in the MBT zone, which are susceptible to various type of mass movement. The rocks making up the slopes has been put to a number of brittle deformation phases during the movement along the MBT, and are traversed by number of joint sets. In the open slope these intersecting joint sets forms wedges and are the most favorable site for initiation of rockfalls and other types of landslides. Landslides are taking place primarily due to high angle slopes, formation of structural wedges along the free steep slopes, sheared nature of the rocks due to proximity to the MBT and neotectonic activities along the MBT and other transverse faults. Wedge failure is a common type of landslides in rock slopes characterized by multiple joints and acts as sliding planes for the failed blocks. Field observations and wedge failure analysis indicates most of the landslides taking place in MBT zone of Kumaun Sub-Himalaya are joint controlled. Safety Factor analysis suggests MBT zone of Kumaun Sub-Himalayan region is prone to landslides and related mass movements. This zone is also neotectonically active as indicated by various geomorphic signatures such as structurally controlled drainage pattern, offsetting of fan by MBT and formation of number of small lakes.Keywords
Landslide, Wedge Failure, Friction Angle, Safety Factor, Siwalik Kumaun Sub-Himalaya, Uttarakhand.References
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