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Comparison of directional and non-directional filter techniques for lineament extraction using landsat-8 OLI to study active tectonics in parts of Northwestern HFT

Author Affiliations

  • 1Department of Applied Sciences, PEC (Deemed to be University), Sector-12, Chandigarh-160012, India
  • 2Department of Applied Sciences, PEC (Deemed to be University), Sector-12, Chandigarh-160012, India

Res. J. Recent Sci., Volume 8, Issue (2), Pages 31-37, April,2 (2019)

Abstract

Himalayan Frontal Thrust (HFT), states the present day physiographic and tectonic frontier amongst the Indian plate and the Himalayan orogeny. It illustrates seismically active faults and connected upliftment which represents a zone of active tectonics between the Siwalik Hills and the Indo-Gangetic Plain. In the foothills of Siwalik along HFT, numerous active fractures have caused several major and destructive earthquakes, it lies under seismic zone IV. The north-western part of Sub-Himalaya is a well-populated area like Chandigarh and small towns and villages near Pinjore dun. A moderate earthquake might produce extensive damages so, the mapping of such seismogenic areas are crucial for mitigation of seismic risk. Lineament mapping with remote sensing data by image processing techniques is a most useful method for the mapping of the structural and tectonic setting of the area. The lineaments are a very good geological and structural indicator to assess general and local trends of deformation and fracture zones in the rocks. Filtering is an image enhancement technique, which is used for edge enhancement of the image. In this work, a comparison of directional and non-directional filtering technique has been made to extract lineaments in parts of northwestern HFT adjacent Ghaggar river. In non-directional filter technique Laplacian filter is used for the linear feature analysis. The filter is a technique of altering/enhancing an image to emphasize certain features or suppress other features. The analysis is carried out by using band 6 of Landsat-8 data, which is automatically processed in LINE component of PCI Geomatica to extract the lineaments. Lineaments extracted by both filter techniques are verified from the,manually digitized geological map. The results observed that lineament extraction with directional filtering gives a better result than non-directional filter techniques.

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