State of tectonic stress in Shillong Plateau of northeast India

Baruah, Santanu; Saikia, Sowrav; Shrivastava, Mahesh N.; Sharma, Antara; Reddy, C. D.; Kayal, J. R.

doi:10.1016/j.pce.2015.11.009

Cited by 18 publications

(10 citation statements)

References 63 publications

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“…A long span of convergence between Indian and Eurasian plates has caused subduction, underthrusting, and extrusion resulting in widespread lithospheric deformation (Molnar et al, 1977;Molnar, 1984;Tapponnier et al, 2001;DeCelles et al, 2002;Nábelek et al, 2009). Recently and in the past, the NE Indian region has experienced a frequent occurrence of moderate to large-size earthquakes due to ongoing active tectonic convergence (Ni and Barazangi, 1984;Pandey et al, 1995;Parvez and Ram, 1997;Kayal, 2008;Baruah et al, 2014Baruah et al, , 2016Le Roux-Mallouf et al, 2020). In response to the collision, the lithospheric part of these three plates experiences horizontal shortening and surface uplift.…”

Section: Introductionmentioning

confidence: 99%

“…IBR is under compression due to oblique subduction of the Indian plate below the Burma plate, where the NE-SW directed stress across the inner and northern arc is switched to the E-W directed stress near the Bengal Basin. Within NE India and SM, Baruah et al (2016) made an investigation on tectonic stress through inversion of the stress tensor. They observed that compressional stress direction changes from NNW-SSE in the western part of the massif to the NNE-SSW direction in its eastern part.…”

Section: Introductionmentioning

confidence: 99%

“…They observed that compressional stress direction changes from NNW-SSE in the western part of the massif to the NNE-SSW direction in its eastern part. Oblique subduction of the Indian plate underneath the IBR causes compression along the NNE-SSW direction (Baruah et al, 2013(Baruah et al, , 2016. The available data set make it possible to study the crustal and upper mantle structure of Lhasa/southern Tibet and IBR.…”

Section: Introductionmentioning

confidence: 99%

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Tomographic Image of Shear Wave Structure of NE India Based on Analysis of Rayleigh Wave Data

Kumar

Mukhopadhyay

et al. 2021

Front. Earth Sci.

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The major scientific purpose of this work is to evaluate the geodynamic processes involved in the development of tectonic features of NE India and its surroundings. In this work, we have obtained tomographic images of the crust and uppermost mantle using inversion of Rayleigh waveform data to augment information about the subsurface gleaned by previous works. The images obtained reveal a very complicated tectonic regime. The Bengal Basin comprises a thick layer of sediments with the thickness increasing from west to east and a sudden steepening of the basement on the eastern side of the Eocene Hinge zone. The nature of the crust below the Bengal Basin varies from oceanic in the south to continental in the north. Indo-Gangetic and Brahmaputra River Valleys comprise ∼5–6-km-thick sediments. Crustal thickness in the higher Himalayas and southern Tibet is ∼70 km but varies between ∼30 and ∼40 km in the remaining part. Several patches of low-velocity medium present in the mid-to-lower crust of southern Tibet along and across the major rifts indicate the presence of either partially molten materials or aqueous fluid. Moho depth decreases drastically from west to east across the Yadong-Gulu rift indicating the complex effect of underthrusting of the Indian plate below the Eurasian plate. Crust and upper mantle below the Shillong Massif and Mikir Hills are at a shallow level. This observation indicates that tectonic forces contribute to the uprising of the Massif.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tomographic Image of Shear Wave Structure of NE India Based on Analysis of Rayleigh Wave Data

Kumar

Mukhopadhyay

et al. 2021

Front. Earth Sci.

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“…This is also in agreement with the gradual eastward shifting of the Dikrong River with the abandonment of paleochannels. Baruah et al (2016) used fault plane solutions for stress inversion method to examine the tectonic stress regime in the Shillong Plateau. Their results suggest that the eastern part of the plateau is R Jayangondaperumal et al…”

Section: Archaeological and Geomorphic Studiesmentioning

confidence: 99%

Active tectonics of Himalaya, rift basins in Central India and those related to crustal deformation at different time scales

Perumal¹,

Mishra²,

Priyanka³

et al. 2020

PINSA

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“…Tectonic stress is one of the fundamental datasets in Earth Sciences comparable with topography, gravity, heat flow and others (Sperner et al 2003). Thus, an investigation into the crustal tectonic stresses is a key point in earth geotectonic studies (Hou et al 2006;Lunina and Gladkov 2007;Ju et al 2013aBaruah et al 2013Baruah et al , 2016Naimi-Ghassabian et al 2015). Furthermore, knowledge of the tectonic stress field can be used in the hydrocarbon industry to foresee stability problems and tectonic fractures (Ju et al 2013b(Ju et al , 2014(Ju et al , 2015, and to optimize reservoir management through tectonic modelling (Sperner et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Tectonic stress pattern in the Chinese Mainland from the inversion of focal mechanism data

Sun

2017

J Earth Syst Sci

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The tectonic stress pattern in the Chinese Mainland and kinematic models have been subjected to much debate. In the past several decades, several tectonic stress maps have been figured out; however, they generally suffer a poor time control. In the present study, 421 focal mechanism data up to January 2010 were compiled from the Global/Harvard CMT catalogue, and 396 of them were grouped into 23 distinct regions in function of geographic proximity. Reduced stress tensors were obtained from formal stress inversion for each region. The results indicated that, in the Chinese Mainland, the directions of maximum principal stress were ∼NE-SW-trending in the northeastern region, ∼NEE-SWW-trending in the North China region, ∼N-S-trending in western Xinjiang, southern Tibet and the southern Yunnan region, ∼NNE-SSW-trending in the northern Tibet and Qinghai region, ∼NW-SE-trending in Gansu region, and ∼E-W-trending in the western Sichuan region. The average tectonic stress regime was strikeslip faulting (SS) in the eastern Chinese Mainland and northern Tibet region, normal faulting (NF) in the southern Tibet, western Xinjiang and Yunnan region, and thrust faulting (TF) in most regions of Xinjiang, Qinghai and Gansu. The results of the present study combined with GPS velocities in the Chinese Mainland supported and could provide new insights into previous tectonic models (e.g., the extrusion model). From the perspective of tectonics, the mutual actions among the Eurasian plate, Pacific plate and Indian plate caused the present-day tectonic stress field in the Chinese Mainland.

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State of tectonic stress in Shillong Plateau of northeast India

Cited by 18 publications

References 63 publications

Tomographic Image of Shear Wave Structure of NE India Based on Analysis of Rayleigh Wave Data

Tomographic Image of Shear Wave Structure of NE India Based on Analysis of Rayleigh Wave Data

Active tectonics of Himalaya, rift basins in Central India and those related to crustal deformation at different time scales

Tectonic stress pattern in the Chinese Mainland from the inversion of focal mechanism data

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