Subsurface Expressions of the Aravalli-Delhi Fold Belt in the Western Ganga Basin by Magnetotellurics

Manglik, A.; Suresh, M.; Danda, Nagarjuna; Pavankumar, G.; Babu, M Demudu; Chakravarthi, N N; Kandregula, Raj Sunil

doi:10.1007/s12594-022-2242-4

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Another MT study 21 along a profile 70 km east of the Roorkee profile suggested a conductive crustal block, which spatially matches a marked thickening of felsic (relatively conductive 52 ) crust between R 1 and R 2 transverse resistive mafic blocks as delineated by Mandal et al 5 . These MT studies also show that the lesser Himalaya has resistive and conductive blocks 53,54 . Manglik et al 54 concluded from their modelling that the ADFB's resistive and conductive blocks may continue beneath the Kumaun-Garhwal Himalaya (KGH).…”

Section: Resultsmentioning

confidence: 67%

“…These MT studies also show that the lesser Himalaya has resistive and conductive blocks 53,54 . Manglik et al 54 concluded from their modelling that the ADFB's resistive and conductive blocks may continue beneath the Kumaun-Garhwal Himalaya (KGH). Thus, one can further infer that the Indian plate crust in the lesser Himalaya is composed of a college of resistive and conductive blocks separated by vertical contacts coinciding with NNW-SSE trending extension of major faults like DHR/MDF, GBF, etc., resulting in a spatially highly heterogeneous crust below the MHT 54 .…”

Section: Resultsmentioning

confidence: 67%

“…Manglik et al 54 concluded from their modelling that the ADFB's resistive and conductive blocks may continue beneath the Kumaun-Garhwal Himalaya (KGH). Thus, one can further infer that the Indian plate crust in the lesser Himalaya is composed of a college of resistive and conductive blocks separated by vertical contacts coinciding with NNW-SSE trending extension of major faults like DHR/MDF, GBF, etc., resulting in a spatially highly heterogeneous crust below the MHT 54 . The H–K stacking of radial PRFs 5 found three NS-to-NNE trending transverse structures (viz., R 1 , R 2 and R 3 ) beneath the KGH with significant upwarping of mafic crust (V p /V s (~ 1.85–2.13)).…”

Section: Resultsmentioning

confidence: 99%

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Evidence of structural segmentation of the Uttarakhand Himalaya and its implications for earthquake hazard

Mandal

Prathigadapa

Srinivas

et al. 2023

Sci Rep

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The earthquake hazard associated with the Main Himalayan Thrust (MHT) is a critical issue for India and its neighbouring countries in the north. We used data from a dense seismic network in Uttarakhand, India, to model the lateral variations in the depths of MHT (2–6% drop in Vs at 12–21 km depths), Moho (a sharp increase in Vs (by ~ 0.5–0.7 km/s) at 39–50 km depths) and lithosphere (a marked decrease in Vs(~ 1–3%) at 136–178 km depths), across the Himalayan collisional front. Our joint inversion of radial PRFs and group velocity dispersion data of Rayleigh waves detects three NNE trending transverse lithospheric blocks segmenting the lithosphere in Uttarakhand Himalaya, which spatially correlate well with the northward extension of the Delhi -Haridwar Indian basement ridge, an inferred tectonic boundary and great boundary fault, respectively. Our radial receiver function imaging detects highly deformed and segmented crustal and lithospheric structures associated with three mapped transverse lithospheric blocks, suggesting a reduction in rupture lengths of future earthquakes, thereby, reducing earthquake hazards in Uttarakhand.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

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Evidence of structural segmentation of the Uttarakhand Himalaya and its implications for earthquake hazard

Mandal

Prathigadapa

Srinivas

et al. 2023

Sci Rep

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“…However, the detailed subsurface architecture of DSZ and its surrounding areas concealed by alluvial sediments is still unclear. and Manglik et al (2022) conducted magnetotelluric (MT) experiments across the DSR and the ADFB, respectively, to image this region in terms of electrical resistivity structure. The results yield a northward dipping electrical conductor (< 10 m) down to 20-25 km for the DSR whereas the ADFB buried beneath the alluvial sediments of the western Ganga Basin consists of a collage of nearly vertical conductive and resistive blocks and a sharp resistive contrast.…”

Section: Magnetotelluric Investigations In the Vicinity Of The Delhi ...mentioning

confidence: 99%

INSA National Report on Seismological Research in India: 2019 – 2022

Manglik

2023

Preprint

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The Indian National Science Academy (INSA), the National Adhering body representing India in the International Union of Geodesy and Geophysics (IUGG), submits a National Report to the IUGG during its General Assembly, held every four years. The present chapter is a compilation for the International Association of Seismology and Physics of the Earth's Interior (IASPEI), one of the eight Associations of the IUGG, encompassing the scientific activities carried out in the country during 2019-2022, in the field of seismology. The chapter is arranged to categorize the contributions under internal structure of the Indian lithosphere and sub-lithospheric mantle, crust and upper mantle deformation, seismic attenuation, seismic hazards, triggered seismicity, environmental seismology, paleoseismology and seismological networks. In addition, the chapter includes activities related to societal projects and outreach programs. It is not an exhaustive review of the entire Indian contribution to seismology and allied fields during this period but a window to the topics covered within the framework of IASPEI.During the reporting period, researchers from several Indian R&D and Academic Institutions continued adding new results on the crustal and upper mantle structure of the Indian shield, both at regional and geological province scale. The Himalaya has been a major focus of seismological research for many Institutes who operated broadband seismological networks from Kashmir to Arunachal along the Himalayan arc. The data from these networks have facilitated in enhancing our understanding of the structure of the Main Himalayan Thrust, crustal and upper mantle structure as well as the dip of the underthrusting Indian plate, seismicity monitoring, and estimation of attenuation. Some of these networks also include accelerographs for strong ground motion studies. A few studies also focused on mapping of the mantle transition zone beneath the Indian Ocean Geoid Low. The studies on anthropogenic seismicity added near-field investigations in the Koyna -Warna region through borehole seismology. Organization of the Joint Scientific Assembly of IAGA and IASPEI during 21-27 August 2021 (JSA-2021) was a major event during this period related to the IUGG activities. Originally, the event was planned to be hosted at Hyderabad, India, but due to the COVID-19 pandemic it was organized in virtual mode. Initiatives have been taken to nucleate the field of environmental seismology in the country.

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Stress state of the northwest Indian shield with emphasis on the Intraplate Delhi Seismic Zone

2023

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Subsurface Expressions of the Aravalli-Delhi Fold Belt in the Western Ganga Basin by Magnetotellurics

Cited by 7 publications

References 26 publications

Evidence of structural segmentation of the Uttarakhand Himalaya and its implications for earthquake hazard

Evidence of structural segmentation of the Uttarakhand Himalaya and its implications for earthquake hazard

INSA National Report on Seismological Research in India: 2019 – 2022

Stress state of the northwest Indian shield with emphasis on the Intraplate Delhi Seismic Zone

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