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Koyna-Warna Shallow Seismic Region, India: Is there Any Geomorphic Expression of Active Tectonics?

  • Research Article
  • Published:
Journal of the Geological Society of India

Abstract

This study investigates the geomorphic expression of tectonic control in Koyna-Warna shallow seismic region, lying on Deccan Flood Basalt in India, by examining longitudinal profiles and morphometric parameters by using Digital Elevation Model (DEM) and constrained field examinations. A total of 60 sub-catchments have been analyzed to comprehend the relative tectonic control in the study area. Sub-catchments within the study area depict channel disequilibrium through stream length-gradient index (SL) and normalized steepness index (ksn) which are ascribed to numerous transient knickpoints along the drainage profiles. The integrated analysis based on six different morphometric parameters (i.e. basin asymmetry, hypsometric integral, stream-length gradient index, valley width-to-height ratio, elongation ratio, and average normalized steepness index) demonstrates two explicit examples of high tectonics in Koyna-Warna region, are (a) between the Koyna Rift Fault Zone (KRFZ) and Patan Fault (PF); and (b) upstream region of left-hand tributaries of the Koyna river.

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Acknowledgements

This research did not receive any financial support from any sources. The author wishes to thank all members in Department of Geography, Savitribai Phule Pune University, for providing necessary facilities. Prof. Vishwas S. Kale is sincerely acknowledged for discussion and suggestions which improved author’s understanding about Deccan rivers, during initial stage of this study. Dr. Nisarg Bhatt (Institute of Seismologic Research, Gujrat) assisted while handling Matlab software. Dr. Arjun Doke and Dr. Rajesh Survase are acknowledged for their assistance during field visits. The author is benefitted from Prof. Kelin X. Whipple through discussion during calculation of normalized steepness index (ksn). Dr. Martin Stokes commented on an early version of this manuscript. Mr. Shantamoy Guha (IIT, Gandhinagar) read the final manuscript and corrected language errors. The Director, India Meteorological Department (IMD, Pune) is acknowledged for proving rainfall data. Constructive comments and detailed suggestions from two anonymous reviewers improved the content of this manuscript significantly. Dr. B Mahabaleshwar (editor-in-chief) and Dr. Ajay Manglik (associate editor) are acknowledged for efficient editorial handling.

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    Sumit Das

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Das, S. Koyna-Warna Shallow Seismic Region, India: Is there Any Geomorphic Expression of Active Tectonics?. J Geol Soc India 96, 217–231 (2020). https://doi.org/10.1007/s12594-020-1541-x

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