This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research Article
Jagabandhu Dixit
Shiv Nadar University
Corresponding Author
ORCiD: https://orcid.org/0000-0002-5450-578X
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This work is licensed under a CC BY 4.0 License. Read Full License
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- The author has confirmed that a statement listing potential conflicts of interest or lack thereof is included in the text.
Assam region lies in the tectonic region of eastern Himalayas and flood plains of River Brahmaputra. The landscape of Assam is formed by the complex integration of the vertical and horizontal movement of the earth’s crust and the depositional and erosional process by a river. The frequency of seismic events results in the deformation of landforms and it highly influences the drainage pattern of the area. The analysis of tectonic or neotectonic activity with the help of morphometric parameters and geomorphic indices helps in the identification of hazard-prone areas of the basin. In the present study, the active tectonics of the Assam region is assessed using SRTM DEM data of 30 m resolution to derive linear and aerial morphometric parameters and eight geomorphic indices of the selected ten basins. The morphometric parameters and geomorphic indices namely, stream length gradient (Sl), valley floor width to height ratio (Vfh), hypsometric curve, hypsometric integral (Hi), asymmetric factor (Af), basin shape index (BS), transverse topographic symmetry (T), basin elongation ratio (BE) and stream sinuosity (SS) are calculated for each basin. With the help of GIS, the indices are classified into three tectonic activity classes i.e., from higher to lower and the average of the classes are combined to generate an index of relative active tectonics (IRAT). The four classes of IRAT are defined for the study area as i) very high; Class 1 (1.57 – 1.80), ii) high; Class 2 (1.81 – 2.06), moderate; Class 3 (2.07 – 2.26) and low; Class 4 (2.27 – 2.30). Class 1 of IRAT corresponds to Basin 1 and 6 with a total area of about 47740 km2, basin 2, 4 and 5 falls under Class 2 of IRAT and its total area is 2507 km2, class 3 covers a total area of 17495 km2 of basin 7,8 and 9 and Class 4 IRAT consists of basin 3 and 10 of total area 2090 km2. Results show that the majority of the study area lies in very high to moderate active tectonic zones and these zones are consistent with the presence of major faults and thrusts of the basin area. It can be concluded that the combined approach of GIS-based morphometric and geomorphic study of a region allows in the identification of deformed landforms resulting from active tectonics.
Keywords
Active tectonics, Assam region, Linear parameters, Areal parameters, Geomorphic indices, IRAT
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research Article
Jagabandhu Dixit
Shiv Nadar University
Corresponding Author
ORCiD: https://orcid.org/0000-0002-5450-578X
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 25 Oct, 2021
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Declarations:
Declarations
- The author has confirmed that a statement listing potential conflicts of interest or lack thereof is included in the text.
Assam region lies in the tectonic region of eastern Himalayas and flood plains of River Brahmaputra. The landscape of Assam is formed by the complex integration of the vertical and horizontal movement of the earth’s crust and the depositional and erosional process by a river. The frequency of seismic events results in the deformation of landforms and it highly influences the drainage pattern of the area. The analysis of tectonic or neotectonic activity with the help of morphometric parameters and geomorphic indices helps in the identification of hazard-prone areas of the basin. In the present study, the active tectonics of the Assam region is assessed using SRTM DEM data of 30 m resolution to derive linear and aerial morphometric parameters and eight geomorphic indices of the selected ten basins. The morphometric parameters and geomorphic indices namely, stream length gradient (Sl), valley floor width to height ratio (Vfh), hypsometric curve, hypsometric integral (Hi), asymmetric factor (Af), basin shape index (BS), transverse topographic symmetry (T), basin elongation ratio (BE) and stream sinuosity (SS) are calculated for each basin. With the help of GIS, the indices are classified into three tectonic activity classes i.e., from higher to lower and the average of the classes are combined to generate an index of relative active tectonics (IRAT). The four classes of IRAT are defined for the study area as i) very high; Class 1 (1.57 – 1.80), ii) high; Class 2 (1.81 – 2.06), moderate; Class 3 (2.07 – 2.26) and low; Class 4 (2.27 – 2.30). Class 1 of IRAT corresponds to Basin 1 and 6 with a total area of about 47740 km2, basin 2, 4 and 5 falls under Class 2 of IRAT and its total area is 2507 km2, class 3 covers a total area of 17495 km2 of basin 7,8 and 9 and Class 4 IRAT consists of basin 3 and 10 of total area 2090 km2. Results show that the majority of the study area lies in very high to moderate active tectonic zones and these zones are consistent with the presence of major faults and thrusts of the basin area. It can be concluded that the combined approach of GIS-based morphometric and geomorphic study of a region allows in the identification of deformed landforms resulting from active tectonics.
This preprint is available for download as a PDF.
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