National Institute of Technology Rourkela

राष्ट्रीय प्रौद्योगिकी संस्थान राउरकेला

ଜାତୀୟ ପ୍ରଯୁକ୍ତି ପ୍ରତିଷ୍ଠାନ ରାଉରକେଲା

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Syllabus

Course Details

Subject {L-T-P / C} : ER5247 : Rheology of the Earth { 3-0-0 / 3}

Subject Nature : Theory

Coordinator : Bhaskar Kundu

Syllabus

Module 1 :

Module 1: Fundamentals of Earth’s Rheology - Introduction to crustal deformation: stress, strain, and rheology of Earth's lithosphere Elastic, viscous, and plastic behavior of geological materials Lithospheric rheology: brittle, ductile, and viscoelastic deformation Experimental and theoretical approaches in rheological studies.

Module 2: Rock Deformation Mechanisms - Frictional sliding and fracture mechanics in brittle materials Crystal plasticity: diffusion creep, dislocation creep, and grain boundary sliding High-pressure and high-temperature rock deformation experiments Influence of temperature, pressure, and fluid presence on rock rheology.

Module 3: Volcanic Deformation and Eruption Dynamics - Strength profiles of the continental and oceanic lithosphere Mantle convection and viscoelastic relaxation Geodynamic processes: isostatic adjustment, post-glacial rebound, and plate motions Seismic anisotropy and deformation in the asthenosphere.

Module 4: Rheology and Tectonic Processes - Rheology of faults and subduction zones: implications for earthquake cycles Strain localization in the lithosphere: shear zones and fault weakening mechanisms Crust-mantle interactions: lithospheric flexure and mountain building The role of fluids in controlling deformation and seismicity.

Module 5: Rheological Modeling and Applications - Analytical and numerical modeling of lithospheric and mantle rheology Maxwell, Kelvin-Voigt, and Burgers models for Earth materials Applications in geodynamic modeling: mantle plumes, rift dynamics, and crustal deformation: Case studies: post-seismic relaxation, glacial isostatic adjustment, and subduction zone rheology.

Course Objective

1 .

Understanding the Rheological Properties of Earth Materials – Introduce fundamental concepts of stress-strain relationships, deformation mechanisms, and rheological behaviors in geological materials.

2 .

Exploring Deformation Mechanisms in the Lithosphere and Mantle – Examine brittle, ductile, and viscoelastic deformation in Earth's lithosphere and deeper mantle.

3 .

Analyzing the Role of Rheology in Geodynamic and Tectonic Processes – Investigate the implications of rheology on fault mechanics, mountain building, and mantle convection.

4 .

Applying Rheological Models in Earth Sciences – Develop and apply analytical and numerical models to study crustal and mantle rheology.
Integrating Rheology into Seismic and Geodynamic Studies – Use rheological principles to interpret seismic anisotropy, post-glacial rebound, and long-term Earth deformation.

Course Outcome

1 .

1. To understand fundamental rheological principles and their application in Earth sciences.
2. To analyze deformation mechanisms in rocks at different pressure-temperature conditions.
3. To evaluate lithospheric and mantle rheology using experimental and observational data.
4. To apply rheological models for geodynamic and tectonic process simulations.
5. To integrate rheological knowledge into seismic hazard assessment and geodynamic studies.

Essential Reading

1 .

Shun-Ichiro Karato, Deformation of Earth Materials, Cambridge University press , 2008

2 .

G. Ranalli, The Rheology of Earth, Cambridge University press , 1998

Supplementary Reading

1 .

J. Jaeger, N. G. Cook and R. Zimmerman, Fundamentals of Rock Mechanics, Wiley-Blackwell , 4th edition, 2007

2 .

Paul Segall, Earthquake and Volcano deformation, Princeton press , 2002

Journal and Conferences

1 .

Bucher, W. H. (1939). Deformation of the Earth’s Crust. Bulletin of the Geological Society of America, 50(3), 421-432.

2 .

Paterson, M. S., & Weiss, L. E. (1961). Symmetry concepts in the structural analysis of deformed rocks. Geological Society of America Bulletin, 72(6), 841-882.