Crustal Configuration of the Northwest Himalaya Based on Modeling of Gravity Data
 Ashutosh Chamoli,
 Anand K. Pandey,
 V. P. Dimri,
 P. Banerjee
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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 ~450kmlong (projected) transect from the SubHimalaya in the south to the Karakoram fault in the north across the IndusTsangpo Suture Zone is modeled using spectral analysis, wavelet transform and forward modeling. The spectral analysis suggests threelayer interfaces in the lithosphere at 68, 34 and 11km 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 178km wavelength at the Moho and the uppercrustal 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.
 Title
 Crustal Configuration of the Northwest Himalaya Based on Modeling of Gravity Data
 Journal

Pure and Applied Geophysics
Volume 168, Issue 5 , pp 827844
 Cover Date
 201105
 DOI
 10.1007/s0002401001492
 Print ISSN
 00334553
 Online ISSN
 14209136
 Publisher
 SP Birkhäuser Verlag Basel
 Additional Links
 Topics
 Keywords

 Crustal structure
 spectral analysis
 gravity anomaly
 wavelet transform
 Himalaya
 Industry Sectors
 Authors

 Ashutosh Chamoli ^{(1)}
 Anand K. Pandey ^{(1)}
 V. P. Dimri ^{(1)}
 P. Banerjee ^{(2)}
 Author Affiliations

 1. National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad, 500007, India
 2. Wadia Institute of Himalayan Geology, Dehradun, 248001, India