Foreland Basin Geometry and Disposition of Major Thrust Faults as Proxies for Identification of Segmentation along the Himalayan Arc

Manglik, A.; Kandregula, Raj Sunil; Pavankumar, G.

doi:10.1007/s12594-022-1928-y

Cited by 13 publications

(10 citation statements)

References 17 publications

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“…This structural segmentation in the Himalayas could be related to the crustal/lithospheric structure and pre-existing tectonic fabric of the underthrusting plate. Modelling of seismological and GPS data has already suggested segmentation of the Indian lithosphere along the arc 2 , 3 , 5 , which has also been evidenced by analysis of topography and Bouguer gravity anomaly data 4 . Several geophysical studies have been carried out to delineate along with arc variations in the crustal structure, geometry of MHT and angle of subduction 6 – 11 .…”

Section: Introductionmentioning

confidence: 76%

“…S 54 b, c). Prior to the Himalayan collision at 50 Ma 2 , 4 , 12 , the DHR and GBF could have been transmitted down from multiple important tectonic events in Peninsular India. With the Indian lithosphere, these inherited transverse characteristics could have been subducted beneath the Eurasian plate 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Dal Zilo et al 11 have also proposed that the inter-seismic coupling at the MHT becomes weaker in the regions coinciding with basement ridges. Thus, these ridges could act as stress barriers to stop the propagation of earthquake rupture 4 . Arc parallel topography and gravity have also been used to study the segmentation of the Indian lithosphere by these transverse ridges, which revealed a new segmentation due to the northward extension of the great boundary fault (GBF) resulting in the generation of smaller strike-slip events along the Kali river near Dharchula 15 .…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…3B) (Duvall et al, 2020;Bashyal, 1998;Friedenreich et al, 1994). Furthermore, the Tertiary reactivation of basement faults has been locally imaged (Manglik et al, 2022;Adilakshmi et al, 2021). Similar tectonic features within the sedimentary wedge and its basement have also been found in western (e.g., Yeats and Takhur, 2008) and eastern India (Karunakaran and Rao, 1976).…”

Section: Thrustmentioning

confidence: 76%

An embryonic fold and thrust belt south of the Himalayan morphological front: Examples from the Central Nepal and Darjeeling piedmonts

Mugnier¹,

Huyghe²,

Large³

et al. 2022

Earth-Science Reviews

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“…Major observation of our analysis is that for the Uttarakhand region, there is a negative correlation, which indeed infers along-strike segmentation of the foreland basin too (Figure4). This segmentation might control the thickness and geometry of sedimentary sequences deposited in the foreland basin Manglik et al (2021Manglik et al ( , 2022. proposed the GBF of the Aravalli-Delhi Fold Belt as a major tectonic boundary segmenting the Indian plate between the Kumaun and the western Nepal sections of the Himalaya.…”

mentioning

confidence: 99%

Normalized Steepness Index along the Himalayan Arc as a proxy for Indian plate segmentation

Kangregula

Gayatri

Manglik

2022

Preprint

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The Indian plate underthrusting the Himalaya is considered to be segmented along the collision belt arc and seismic images of the Indian mantle lithosphere (IML) suggest along-arc variations in the angle of underthrusting and its northern limit beneath Tibet. The pre-existing transverse tectonic structures of the Indian plate mapped in the Ganga foreland basin have been related to these segmentation boundaries. These segmentations imply changes in mechanical properties of adjoining blocks which should manifest in the form of spatial variations in topography build-up. We have analysed a geomorphic index, normalized channel steepness (ksn), along the Himalayan arc using the ALOS elevation dataset to test whether there is any correlation between the and these segmentation boundaries. Our results bring out spatial variability in the along the arc. Based on these results, the arc can be segmented into five blocks, similar to the ones delineated based on correlation between the width of the Ganga foreland basin and the disposition of major Himalayan thrusts from the foothills. Thus, the can be used as a proxy to demarcate different tectonic blocks along the Himalayan arc. Further, we have found a good correlation between the basin width and the northern limit of the IML for all block except the Uttarakhand block. We infer that transverse crustal heterogeneities in this block due to the continuation of different litho-units of the Aravalli-Delhi Fold Belt could be a plausible cause for this anti-correlation.

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Foreland Basin Geometry and Disposition of Major Thrust Faults as Proxies for Identification of Segmentation along the Himalayan Arc

Cited by 13 publications

References 17 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

An embryonic fold and thrust belt south of the Himalayan morphological front: Examples from the Central Nepal and Darjeeling piedmonts

Normalized Steepness Index along the Himalayan Arc as a proxy for Indian plate segmentation

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