Ritabrata Dasgupta

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Verified

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• PhD
• Postdoctoral Researcher at Yonsei University

The intraplate volcanism in East Asia exhibits large variations in the hydrous plume geometry and dynamic topography, but the geological processes that cause these variations remain unclear. The presence of hydrous minerals and melts within the small hydrous plumes (SHPs) formed from the stagnant Pacific slab in the mantle transition zone significa...

In volcanic belts, magma influx into magma chambers generates excess pressure, amplifying the initial stress field to cause crustal deformation with significant ground displacements, which manifests in topographic relief. Quantifying such volcano-driven ground surface displacements is a fundamental requirement to embark on a criticality analysis of...

The process of small-scale mantle plume emplacement within the continental lithosphere influences the dynamic topography and architecture of the lithosphere-asthenosphere boundary (LAB). Furthermore, plume emplacement alters the rheology of the crust and lithospheric mantle through melt-driven, mechanical and thermal weakening. Previous studies of...

The crustal components in a magma plumbing system often contain mechanically heterogeneous layers and structural discontinuities such as pre-existing fracture (PEF) systems. Such layers and discontinuities, depending upon their mechanical properties, can either facilitate upward magma movement or inhibit it at some depths by acting as stress barrie...

The crustal components in a magma plumbing system often contain mechanically heterogeneous layers and structural discontinuities such as pre-existing fracture (PEF) systems. Such layers and discontinuities, depending upon their mechanical properties, can either facilitate upward magma movement or inhibit it at some depths by acting as stress barrie...

Magmatic overpressure in shallow-and mid-crustal magma chambers (MC) can deform the crustal host rocks. Stress field produced by such deformation often control the nucleation and subsequent crack formation for magma emplacement. A direction of physical volcanology is concerned with determination of the volcanotectonic ground surface displacements t...

Subduction of lithospheric plates produces narrow, linear troughs (trench) in front of the overriding plates at the convergent boundaries. The trenches show a wide variation in their topographic characteristics, such as width, vertical depth, and bounding surface slopes. Benchmarking their controlling factors is thus a crucial step in the analysis...

The Sunda Plate has shaped itself in a complex tectonic framework, driven by the interactions of multiple subduction zones in its history, which is currently bounded by two major N-S trending active trenches: Andaman-Sumatra-Java and Philippines on its western and eastern margins, respectively. The inter-trench distance (ITD,) varies from 3000 to 5...

The Sunda plate has shaped itself in a complex tectonic framework, driven by the interactions of multiple subduction zones in its history. Using thermo-mechanical computational fluid dynamic models we show in this paper how the in-dip double-subduction dynamics has controlled the first-order 3D topography of this plate, currently bounded by two maj...

The Sunda plate has shaped itself in a complex tectonic framework, driven by the interactions of multiple subduction zones in its history. Using thermo-mechanical computational fluid dynamic models we show in this paper how the in-dip double-subduction dynamics has controlled the first-order 3D topography of this plate, currently bounded by two maj...

By combining scaled laboratory experiments and numerical simulations, this study presents a quantitative analysis of the bending radius (R B) of subducting slabs within the upper mantle, taking into account the effects of age (A). Based on a half-space cooling model, we constrain the density (ρ), viscosity (η), and thickness (h) of slabs as a funct...

By combining scaled laboratory experiments and numerical simulations, this study presents a quantitative analysis of the bending radius (RB) of subducting slabs within the upper mantle, taking into account the effects of age (A). Based on a half-space cooling model, we constrain the density (ρ), viscosity (η) and thickness (h) of slabs as a functio...

By combining scaled laboratory experiments and numerical simulations, this study presents a quantitative analysis of the bending radius of subducting slabs within the upper mantle, taking into account the effects of age. Based on a half-space cooling model, we constrain the den-sity, viscosity and thickness of slabs as a function of A, and develop...

Oceanic plate subduction can exert extensional, compressional or both types of deformations simultaneously in overriding plates. In this study, we explore the factors controlling these two competing modes of deformation in response to contrasting stress fields. Two-dimensional computational fluid dynamics models are presented to show that the dip a...

Mid-ocean ridges (MORs) form in the lithosphere along the upwelling zones in the mantle where the lithospheric plates show divergent plate motion. MORs are intensely segmented by transform and transcurrent faults- represent the most common and spectacular surficial expression of global tectonics. However, despite of an enormous development of mid-o...

The surface topography in a subduction zone evolves through a complex interplay of gravity and viscous forces. A lion share comes from the isostatic force (H), accompanied by significant contributions from flexural bending (F) and dynamic topography (DT). Flexural bending is a lithospheric phenomenon. which mostly influences the topographic develop...

This work is aiming at analyzing the vorticity vector in 2D of deformable inclusions with the help of analytical techniques. The considerations made are first, inclusions are initially spherical, deformable; second, strain distribution within the inclusions are not homogeneous . The ratio of inclusion diameter (“a”) to mean inter-inclusion distance...