Debasis D. Mohanty

North East Institute of Science and Technology

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Arun Singh

Indian Institute of Technology Kharagpur

Poulommi Mondal

Academy of Scientific and Innovative Research

M. Ravi Kumar

National Geophysical Research Institute

Chandrani Singh

Indian Institute of Technology Kharagpur

Satyapriya Biswal

Academy of Scientific and Innovative Research

Tuna Eken

Istanbul Technical University

D. Srinagesh

National Geophysical Research Institute

Dipankar Saikia

Indian National Centre for Ocean Information Services

M. Ravi Kumar

National Geophysical Research Institute

Kazunori Yoshizawa

Hokkaido University

Cooperative Institutions

Council of Scientific and Industrial Research

Indian Institute of Technology Kharagpur

National Geophysical Research Institute

Academy of Scientific and Innovative Research

North East Institute of Science and Technology

Government of India

Ministry of Earth Sciences

Institute of Seismological Research

University of Oregon

Cascade (United States)

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Lg attenuation tomographic models of Himalaya and southern Tibet

Tectonophysics (2015)

Chandrani Singh P. Mondal Sagar Singh Debasis D. Mohanty Namrata Jaiswal

10.1016/j.tecto.2015.09.009

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Citations (27)

Evidence of heterogeneous and unstable anisotropic settings beneath the Northeast Indian lithosphere from characterization of null splitting measurements

Acta Geophysica (2021)

Debasis D. Mohanty Poulommi Mondal

Null (SQL)

10.1007/s11600-021-00676-5

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Citations (5)

Implications on source localization and central depth of anisotropy beneath the Sikkim Himalaya: an appraisal on lithospheric deformation

Satyapriya Biswal Gourab Dey Debasis D. Mohanty

For the understanding of deformational mechanism and geodynamics of a tectonic set up, the source localization and central depth of anisotropy plays a vital role. Though mantle dynamics and deformation patterns can be understood from studying the shear wave splitting mechanism, the true interpretation of under earth mechanism governing the geodynamics remains little biased and unrealistic without the&#160; proper justification and identification of the source localization and depth of anisotropy. Our present study is focused on the possible central depth determination and source localization of anisotropy beneath the Sikkim Himalayan region based upon the well-established spatial coherency method of Splitting parameters, an improved and dynamic principle of grid search analysis based on the Fresnel zone concept. The principle is based upon the maximum coherency relation between the splitting parameters suggested by a minimization in the variation factor as a function of true depth of the anisotropy. Sikkim Himalaya, sandwiched between the central Nepal Himalaya and the eastern Bhutan Himalaya, demarcates the distinct change in the width of the Himalayan foreland basin and the Main Himalayan Thrust (MHT), which is a part of the active deforming eastern Himalayan fold axis and thrust belt. The Spatial coherency analysis of splitting parameters suggests the central depth of heterogeneity at around 130 km beneath this Sikkim Himalayan region as a consequence of the deformation patterns governed by the complex lithospheric mass at this particular depth.&#160;KEYWORDSSpatial coherency, Shear wave splitting, Sikkim Himalaya, lithosphere.

geodynamics

Main Central Thrust

Shearing (physics)

10.5194/egusphere-egu22-9402

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Correction to: Evidence of heterogeneous and unstable anisotropic settings beneath the Northeast Indian lithosphere from characterization of null splitting measurements

Acta Geophysica (2022)

Debasis D. Mohanty Poulommi Mondal

Null (SQL)

Characterization

10.1007/s11600-022-00732-8

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Mantle deformation patterns beneath southern Tibet using splitting of direct-S waves

EGUGA (2016)

Debasis D. Mohanty Tuna Eken Arun Singh Chandrani Singh M. Ravi Kumar

Source

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P wave velocity structure below India and Tibet incorporating anisotropic delay time effects

Geochemistry Geophysics Geosystems (2016)

Debasis D. Mohanty Arun Singh L. O'Driscoll M. Ravi Kumar D. Srinagesh

Abstract We incorporate the effects of anisotropy to refine the continental‐scale 3‐D isotropic velocity model previously produced for India and Tibet by inverting 52,050 teleseismic P wave residuals. We have exploited a total of 1648 individual SKS splitting parameters to calculate the P wave travel time corrections due to azimuthal anisotropy. Our results suggest that anisotropy affects the P wave delays significantly (−0.3 to +0.5 s). Integration of these corrections into the 3‐D modeling is achieved in two ways: (a) a priori adjustment to the delay time vector and (b) inverting only for anisotropic delays by introducing strong damping above 80 km and below 360 km depths and then subtracting the obtained anisotropic artifact image from the isotropic image, to get the corrected image. Under the assumption of azimuthal anisotropy resulting from lattice preferred orientation (LPO) alignment due to horizontal flow, the bias in isotropic P wave tomographic images is clear. The anisotropy corrected velocity perturbations are in the range of ±1.2% at depths of around 150 km and reduced further at deeper levels. Although the bias due to anisotropy does not affect the gross features, it does introduce certain artifacts at deeper levels.

10.1002/2015gc006064

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Citations (15)

Future prediction of existing glacial lake’s size in the Himalaya by Markov model and glacial surface topography

All Earth (2023)

Litan Mohanty Vishal Pateswary Sabyasachi Maiti Debasis D. Mohanty

Glacial lakes in the Himalayas are increasing in size and number at an alarming rate, with the majority of lakes concentrated in the eastern and central parts of the mountain range. This research focuses on the future prediction of regional-scale glacial lake size in the entire Himalayan mountain range to avoid future glacial lake outburst flood (GLOF). Here, we used Landsat TM and OLI images, Google Earth imageries, Cartosat DEM, and SRTM DEM, and used some techniques: average lake size change rate, Markov model and glacial surface topography to extract glacial lake size change and future prediction of lake size. A total of 9675 individual glacial lakes were noticed during the study period (1990–2020), out of which the lakes present constantly throughout the study period (with size > 0.01 km2) were added in this study.1This study used two methods (i.e., Markov model and Glacier surface topography) to predict future lake size and identified 191 and 94 critical lakes that are most at risk of enlargement in Markov and glacial surface topography, respectively. Moreover, 443 critical lakes in Himalaya is distributed as 227 in the eastern Himalayas, 195 in the central Himalayas, and 21 in the western Himalayas. The findings suggest that the number and size of glacial lakes will continue to increase, posing an even greater risk of GLOFs in the future.

Glacial lake

10.1080/27669645.2023.2256034

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Citations (2)

Seismic hazard evaluation of Nepal region: a particular emphasis on 2015 Gorkha earthquake scenario

Research Square (Research Square) (2023)

Atul Saini Debasis D. Mohanty Himanshu Mittal

Abstract The tectonic collision between the Indian and Eurasian plates since 50 million years is responsible for creating the Nepal Himalayan zone as part of the whole Himalayan orogeny belt. As a result of this collision, major changes and deformation in Earth have been evolving through ongoing stress build-up and release. In this study, an overview of the stress distribution has been made by using the Frequency-magnitude relation across the Nepal Himalayan region, which is supported by an extensive analysis of b-values and their spatiotemporal variations. Abruptly the whole region is being divided into four sub-regions. The consequences of b-value changes have been thoroughly examined for a better and minute analysis of the present-day hazardous scenario of this Nepal Himalayan region. Two highly stressed areas have been observed in Nepal's eastern and westernmost parts by interpreting the b-values. The depth sections of the b-value are estimated across the two zones revealing that these stress-accumulated regions are increasing in depth with an increase in latitude towards the north. A moderately stressed area was also found, which is concentrated mainly around the MCT fault in the western part. A particular emphasis on the 2015 Gorkha region has been carried out to analyze this region's pre- and post-earthquake scenarios and stress patterns. The analysis revealed that most of the stress released by the Gorkha earthquake was concentrated in the western side of the event, whereas the eastern side was still moderately stressed.

Orogeny

Collision zone

10.21203/rs.3.rs-3218212/v1

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Significant seismic anisotropy beneath southern Tibet inferred from splitting of direct S-waves

Physics of The Earth and Planetary Interiors (2015)

Arun Singh Tuna Eken Debasis D. Mohanty Dipankar Saikia Chandrani Singh

Shear wave splitting

Seismic anisotropy

Shear waves

Indus