Spatial variations of crustal thickness and Poisson's ratio in the northeastern region of India based on receiver function analysis

Shukla, Neeharika; Hazarika, Devajit; Kundu, Abhishek; Mukhopadhyay, S.

doi:10.1002/gj.4469

Cited by 6 publications

(4 citation statements)

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“…A high Poisson's ratio (0.277-0.293) is obtained for the Tidding Tuting Suture Zone (TTSZ) and western part of the LPC, indicating the presence of aqueous fluid/partial melt in the crust (Kundu et al, 2020). Shukla et al (2022) investigated the crustal configuration beneath northeast India based on receiver function analysis of teleseismic earthquakes recorded by 19 broadband seismological stations using H-k stacking method. The study reveals a large variation in crustal thickness and Poisson's ratio which are correlated with the complex geology and tectonics of the region.…”

Section: Himalayamentioning

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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Section: Himalayamentioning

confidence: 99%

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

Manglik

2023

Preprint

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“…In this article, Shukla et al (2022) adopted H‐k stacking analysis of teleseismic RFs recorded at 19 stations and estimated crustal thickness and Poisson's ratio at each station. They have established a large variation in crustal thickness and Poisson's ratio which are correlated with the complex geology and tectonics of the region.…”

Section: Research Outputs Of Special Issue‐ Partmentioning

confidence: 99%

“…Geological map of Eastern Himalaya, Indo‐Myanmar orogenic belt, northern, Central Myanmar, and adjacent areas (modified after Mitchell et al, 2007; Searle et al, 2007; Y. R. Singh, Singh, Singh, et al, 2022). Locations of study area presented in the issue include 1/S2: Kundu and Hazarika (2022); 2/S2: Y. R. Singh, Singh, Singh, et al (2022); 3/S2: Rawat and Luirei (2022); 4/S2: Kayal et al (2022); 5/S2: Choudhury et al (2022); 6/S2: N. M. Sharma et al (2022); 7/S2: Goswami, Gogoi, et al (2022); 8/S2: Bikramaditya et al (2022); 9/S2: Goswami, Kalita, et al (2022); 10/S2: Joshi (2022); 11/S2: Jha and Sharma (2022); 12/S2: Shukla et al (2022); 13/S2: Khonglah et al (2022); 14/S2: Ali and Duarah (2022); 15/S2: Mohanty et al (2022); 16/S2: Chanu et al (2022); 17/S2: Majumdar, Gogoi, and Ghatak (2022); Majumdar, Gogoi, Ghatak, Saikia, et al (2022); 18/S2: Ding et al (2022); 19/S2: Ghose et al (2022); 20/S2: Hussain and Dey (2022); 21/S2: Ozukum et al (2022); 22/S2: Jamir et al (2022); 23/S2: Chaubey et al (2022); 24/S2: Bora, Borah, et al (2022); Bora, Mukherjee, et al (2022); 25/S2: Khuman and Ibotombi (2022); 26/S2: Y. R. Singh, Singh, Singh, et al (2022); 27/S2: Thokchom and Kshetrimayum (2021); 28/S2: Barman et al (2022); 29/S2: V. Sharma and Biswas (2022)…”

Section: Introductionmentioning

confidence: 99%

Introduction, Part 2—Geodynamic evolution of Eastern Himalaya and Indo‐Myanmar orogenic belts: Advances through interdisciplinary studies

2022

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The geology of Eastern Himalaya, the Indo‐Myanmar orogenic belt (IMOB), the Shillong Plateau and its adjoining regions have a distinct entity in the tectonic framework of South‐east Asia. A considerable gap exists in our knowledge of the geology of the Eastern Himalaya, IMOB, Shillong Plateau, Assam–Arakan Basin, and ophiolites of Northeast India. In order to fulfil the gap to some extent two Special Issues were proposed through advanced interdisciplinary studies of geosciences. A total of 29 research papers cover articles of interdisciplinary studies of geosciences to understand the magmatism and exhumation history of the crystalline core, pressure, temperature, time, and deformation (P–T–t–d) conditions of the geologically least explored Eastern Himalaya and IMOB and adjoining regions are included in this Special Issue. This Special issue‐Part 2 is a continuation of an earlier Special Issue‐Part 1 published in vol. 57 (2), GJ with 26 research articles. This Special Issue will provide state‐of‐art information on the geodynamic evolution of the Eastern Himalaya and Indo‐Myanmar orogenic belt in the tectonic framework of South‐east Asia and will help in planning future guidelines to explore this one of the least studied geological terrains. Overall, this Special Issue will have the potential to become a reference volume for researchers, particularly working in the Eastern Himalaya, Shillong Plateau, Assam–Arakan Basin, and ophiolites of North‐east India. This volume will also be useful to future researchers and will also have the potential to become a reference volume for researchers, particularly working in the north‐eastern part of India and adjoining regions.

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“…Studies suggest that subsurface tectonic are still active across the Shillong plateau, Mikir hills, Arakan-Yoma fold belt, Naga hills, parts of Bengal basin, lower-upper Brahmaputra valley along with the Mishmi hills of Himalayan foothills (Hazarika et al, 2022;Shukla et al, 2022). The available information about the thrust-faults is very limited and most of the information are available from the geographic information system (GIS) map, others field geological studies and very limited from seismic and other geoscientific data sources.…”

Section: Introductionmentioning

confidence: 99%

Integrated interpretation of most positive and most negative curvature of ground gravity data across the Shillong plateau and Mikir hills periphery, north-east India

Ghosh

2022

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The study area falls in one of the utmost seismically vigorous zones covering latitude 23°–28°N and longitude 88°–96°E in the north-eastern part of India. Various studies suggest that tectonic activities are still active across the Shillong plateau, Mikir hills, Arakan-Yoma fold belt, Naga hills, parts of Bengal basin, lower-upper Brahmaputra valley along with the Mishmi hills of Himalayan foothills. The available information about the thrust-faults in the area is very limited and most of the information are available from the geographic information system map, field geological studies and very limited from seismic and other data sources. In this present study, attempt has been made to carry out details study of most positive and most negative curvature attributes for understanding sub-surface structural features and able to identify structural lineament/thrust-fault in the study area using available ground gravity data in the north-eastern part of India. Further, present studied results are correlated and compared with the past derived results of three-dimensional Euler source depth locations and source edge estimations in this area. The integrated results of the curvature interpretation look promising and can able to delineate the thrust–fault locations. This paper also suggests additional new thrust-fault lineament information. As the gravity data has its own constraint hence integrated study can help to provide for better geoscientific information.

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Spatial variations of crustal thickness and Poisson's ratio in the northeastern region of India based on receiver function analysis

Cited by 6 publications

References 62 publications

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

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

Introduction, Part 2—Geodynamic evolution of Eastern Himalaya and Indo‐Myanmar orogenic belts: Advances through interdisciplinary studies

Integrated interpretation of most positive and most negative curvature of ground gravity data across the Shillong plateau and Mikir hills periphery, north-east India

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