Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya

Abstract We image the lateral variations in the Moho depths and average crustal composition across the Kumaon–Garhwal (KG) Himalaya, through the H–K stacking of 1400 radial PRFs from 42 three-component broadband stations. The modelled Moho depth, average crustal Vp/Vs, and Poisson’s ratio estimates...

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Autores principales:	Prantik Mandal, D. Srinivas, G. Suresh, D. Srinagesh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/133fd2b0f03f42c69cf02bacc39219da
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spelling	oai:doaj.org-article:133fd2b0f03f42c69cf02bacc39219da2021-12-02T15:22:57ZModelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya10.1038/s41598-021-93469-12045-2322https://doaj.org/article/133fd2b0f03f42c69cf02bacc39219da2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93469-1https://doaj.org/toc/2045-2322Abstract We image the lateral variations in the Moho depths and average crustal composition across the Kumaon–Garhwal (KG) Himalaya, through the H–K stacking of 1400 radial PRFs from 42 three-component broadband stations. The modelled Moho depth, average crustal Vp/Vs, and Poisson’s ratio estimates vary from 28.3 to 52.9 km, 1.59 to 2.13 and 0.17 to 0.36, respectively, in the KG Himalaya. We map three NS to NNE trending transverse zones of significant thinning of mafic crust, which are interspaced by zones of thickening of felsic crust. These mapped transverse zones bend toward the north to form a NE dipping zone of maximum changes in Moho depths, below the region between Munsiari and Vaikrita thrusts. The 1991 Mw6.6 Uttarakashi and 1999 Mw6.4 Chamoli earthquakes have occurred on the main Himalayan thrust (MHT), lying just above the mapped zone of maximum changes in Moho depths. Modelled large values of average crustal Vp/Vs (> 1.85) could be attributed to the high fluid (metamorphic fluids) pressure associated with the mid-crustal MHT. Additionally, the serpentinization of the lowermost crust resulted from the continent–continent Himalayan collision process could also contribute to the increase of the average crustal Vp/Vs ratio in the region.Prantik MandalD. SrinivasG. SureshD. SrinageshNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Prantik Mandal D. Srinivas G. Suresh D. Srinagesh Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya
description	Abstract We image the lateral variations in the Moho depths and average crustal composition across the Kumaon–Garhwal (KG) Himalaya, through the H–K stacking of 1400 radial PRFs from 42 three-component broadband stations. The modelled Moho depth, average crustal Vp/Vs, and Poisson’s ratio estimates vary from 28.3 to 52.9 km, 1.59 to 2.13 and 0.17 to 0.36, respectively, in the KG Himalaya. We map three NS to NNE trending transverse zones of significant thinning of mafic crust, which are interspaced by zones of thickening of felsic crust. These mapped transverse zones bend toward the north to form a NE dipping zone of maximum changes in Moho depths, below the region between Munsiari and Vaikrita thrusts. The 1991 Mw6.6 Uttarakashi and 1999 Mw6.4 Chamoli earthquakes have occurred on the main Himalayan thrust (MHT), lying just above the mapped zone of maximum changes in Moho depths. Modelled large values of average crustal Vp/Vs (> 1.85) could be attributed to the high fluid (metamorphic fluids) pressure associated with the mid-crustal MHT. Additionally, the serpentinization of the lowermost crust resulted from the continent–continent Himalayan collision process could also contribute to the increase of the average crustal Vp/Vs ratio in the region.
format	article
author	Prantik Mandal D. Srinivas G. Suresh D. Srinagesh
author_facet	Prantik Mandal D. Srinivas G. Suresh D. Srinagesh
author_sort	Prantik Mandal
title	Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya
title_short	Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya
title_full	Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya
title_fullStr	Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya
title_full_unstemmed	Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya
title_sort	modelling of crustal composition and moho depths and their implications toward seismogenesis in the kumaon–garhwal himalaya
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/133fd2b0f03f42c69cf02bacc39219da
work_keys_str_mv	AT prantikmandal modellingofcrustalcompositionandmohodepthsandtheirimplicationstowardseismogenesisinthekumaongarhwalhimalaya AT dsrinivas modellingofcrustalcompositionandmohodepthsandtheirimplicationstowardseismogenesisinthekumaongarhwalhimalaya AT gsuresh modellingofcrustalcompositionandmohodepthsandtheirimplicationstowardseismogenesisinthekumaongarhwalhimalaya AT dsrinagesh modellingofcrustalcompositionandmohodepthsandtheirimplicationstowardseismogenesisinthekumaongarhwalhimalaya
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Modelling of crustal composition and Moho depths and their Implications toward seismogenesis in the Kumaon–Garhwal Himalaya

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