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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6014
Title: Crustal configuration of the Northwest Himalaya based on modeling of gravity data
Authors: Chamoli, Ashutosh
Pandey A.K.
Dimri V.P.
Banerjee P.
Published in: Pure and Applied Geophysics
Abstract: The gravity response and crustal shortening in the Himalayan belt are modeled in detail for the first time in the NW Himalaya. The Bouguer gravity anomaly along a ~450-km-long (projected) transect from the Sub-Himalaya in the south to the Karakoram fault in the north across the Indus-Tsangpo Suture Zone is modeled using spectral analysis, wavelet transform and forward modeling. The spectral analysis suggests three-layer interfaces in the lithosphere at 68-, 34- and 11-km depths corresponding to the Moho, the Conrad discontinuity and the Himalayan decollement thrust, respectively. The coherence, admittance and cross spectra suggest crustal shortening because of convergence compensated by lithospheric folding at 536- and 178-km wavelength at the Moho and the upper-crustal level. An average effective elastic thickness of around 31 km is calculated using the coherence method. The gravity data are modeled to demarcate intracrustal to subcrustal regional thrust/fault zones. The geometrical constraints of these faults are obtained in the space scale domain using the wavelet transform, showing good correlation with the major tectonic boundaries. The crustal configuration along the transect shows how the Moho depth increases from 45 to 80 km towards the north with the locus of flexure of the Indian crust beneath the Higher Himalayan zone. The combination of forward modeling and wavelet analysis gives insight into the subsurface extent and geometry of regional structures across the NW Himalaya. © 2010 Springer Basel AG.
Citation: Pure and Applied Geophysics (2011), 168(5): 827-844
URI: https://doi.org/10.1007/s00024-010-0149-2
http://repository.iitr.ac.in/handle/123456789/6014
Issue Date: 2011
Keywords: Crustal structure
Gravity anomaly
Himalaya
Spectral analysis
Wavelet transform
ISSN: 334553
Author Scopus IDs: 15049168200
7201771344
6701412447
13406884000
Author Affiliations: Chamoli, A., NationalGeophysicalResearch Institute, Council of Scientific and Industrial Research, Hyderabad 500007, India
Pandey, A.K., Wadia Institute of Himalayan Geology, Dehradun 248001, India
Dimri, V.P., NationalGeophysicalResearch Institute, Council of Scientific and Industrial Research, Hyderabad 500007, India
Banerjee, P., NationalGeophysicalResearch Institute, Council of Scientific and Industrial Research, Hyderabad 500007, India
Funding Details: 1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad 500007, India. E-mail: chamoli.a@gmail.com 2 Wadia Institute of Himalayan Geology, Dehradun 248001;We thank the anonymous reviewers for the thorough suggestions, which improved the manuscript to the present form. PB acknowledges funding from DST, New Delhi, which enabled the field data generation in the NW Himalaya. We thank Dr. F.J. Simons for the discussion on the computer code for elastic thickness estimation. The conversations about various issues of gravity data with Drs. D.C. Mishra, A.R. Bansal, V.M. Tiwari, Uma Shankar and on Himalayan tectonics with Dr. V.C. Thakur are gratefully acknowledged.
Corresponding Author: Chamoli, A.; NationalGeophysicalResearch Institute, Council of Scientific and Industrial Research, Hyderabad 500007, India; email: chamoli.a@gmail.com
Appears in Collections:Journal Publications [ES]

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