A5012519890- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Rock Mechanics and Modeling
- High-pressure geophysics and materials
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Planetary Science and Exploration
- Coal Properties and Utilization
- Drilling and Well Engineering
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Geotechnical and Geomechanical Engineering
- Hydraulic Fracturing and Reservoir Analysis
- High-Velocity Impact and Material Behavior
- Seismic Imaging and Inversion Techniques
- Geological Studies and Exploration
- Geomagnetism and Paleomagnetism Studies
- Paleontology and Stratigraphy of Fossils
- Geological Modeling and Analysis
- Granular flow and fluidized beds
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Metal and Thin Film Mechanics
- Soil and Unsaturated Flow
Indian Institute of Technology Kanpur
2015-2024
University of KwaZulu-Natal
2012-2017
GNS Science
2013-2015
ETH Zurich
2009-2015
École Polytechnique Fédérale de Lausanne
2012-2014
Indian Institute of Technology Kharagpur
2008-2014
Jadavpur University
2004-2009
Board of the Swiss Federal Institutes of Technology
2009
Indian Statistical Institute
2001
Kumaun University
1981-1992
Research Article| November 01, 1969 Late Precambrian (?) Fossils from Southeastern Newfoundland S. B MISRA Department of Geology, Memorial University Newfoundland, St. John's, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (1969) 80 (11): 2133–2140. https://doi.org/10.1130/0016-7606(1969)80[2133:LPFFSN]2.0.CO;2 Article history received: 23 Dec 1968 rev-recd: 21 Apr first online: 02 Mar 2017 Cite View This Citation Add to Manager Share Icon MailTo Twitter...
Abstract Slow moving landslides regulated by precipitation/snowmelt induced subsurface pore‐pressure transients can sometimes accelerate to catastrophic failure causing loss of infrastructure and lives. Yet, unified theories the transition slow into ultimately ones in response changes remain relatively unexplored. Here, we use a simple gravity‐driven block‐slider model governed laboratory‐derived rate‐and‐state friction (RSF) equations with velocity‐weakening parameters analyze mechanical...
Understanding gas flow in depleted unconventional reservoirs is crucial but limited, particularly organic-rich shale with ultrafine nanopores and high matrix compressibility. Here, we assess the apparent permeability (kapp) along perpendicular parallel to bedding, as well through fractures─using samples from three petroliferous basins India. Our experiments simulate reservoir conditions varying mean pore pressures (Pm), using both sorbing (N2, CO2) nonsorbing (He, Ar) gases, results are...
Research Article| April 03, 2018 Microscopic anatomy of a "hot-on-cold" shear zone: Insights from quartzites the Main Central Thrust in Alaknanda region (Garhwal Himalaya) Nicholas J.R. Hunter; Hunter † 1School Earth, Atmosphere and Environment, Monash University, Clayton, Victoria 3800, Australia †nicholas.hunter@monash.edu Search for other works by this author on: GSW Google Scholar Roberto F. Weinberg; Weinberg Christopher J.L. Wilson; Wilson Vladimir Luzin; Luzin 2Australian Centre...
Open system metasomatic processes generally involve change of volume. Volumetric strain resulting from fluid-mediated mass transfer in rocks is commonly inferred bulk-rock chemical mass-balance analysis. But the manner which such volume accommodated deeper crust remains enigmatic. The occurrence geometrically well-defined reaction zones at boundary between country rock (pelitic garnet-mica schist) and metamafic dikes (epidote-amphibolites) Archean Singbhum craton eastern India provides an...
Mineralogical composition and porosity significantly influence the mechanical behavior of hydrocarbon reservoir rocks in crustal conditions. To understand failure dynamic changes with axial loading, triaxial compression experiments were conducted, three distinct rock types: KG Basin Sandstone, Bombay High limestone, Boise Sandstone. Initial porosities collected samples varied; sandstone at 30%-32%, limestone 9.5%-12.7%, 20.6%-25%, determined under dry testing A range effective pressures...
Frictional strength of a fault surface is controlled by the yield microscopic asperities. During any quasi-stationary contact, these asperities transiently creep to characteristic nm-to-μm length scale achieve steady-state strain-rate, which governs “state” evolution interface. In Low-Temperature Plasticity regime, predominantly deform through dislocation density at junction. While statistically stored dislocations (ρSSD) controls deformation asperities,...
 A subgrain-size piezometer is intended to be free from subsidiary effects of recrystallisation, such as phase mixing and pinning, unlike the classical grain-size piezometers, which are best limited monomineralic samples avoid these effects. Previously calibrated piezometers have a wide range uncertainty in stress for given intercept length. The log-log linear regression fits contribute large impractical error ranges space. reason behind this behaviour could method applied measure...
Research Article| April 01, 1971 Stratigraphy and Depositional History of Late Precambrian Coelenterate-Bearing Rocks, Southeastern Newfoundland S. B MISRA Department Geology, Memorial University Newfoundland, St. John's, Canada AUTHOR'S PRESENT ADDRESS: DEPARTMENT OF GEOLOGY, LUCKNOW UNIVERSITY, LUCKNOW, INDIA Search for other works by this author on: GSW Google Scholar GSA Bulletin (1971) 82 (4): 979–988. https://doi.org/10.1130/0016-7606(1971)82[979:SADHOL]2.0.CO;2 Article history...
Abstract This study shows how inherited strength anisotropy influences damage localization at both the tip and wall regions of a fault or fracture. We performed analogue numerical compression experiments on transversely isotropic models with single multiple cuts finite length, simulating propagation preexisting faults cracks in layered rock. The stress‐strain curves from show change bulk yield behavior inclination orientation respect to stress direction. Earlier demonstrated brittle (wing...
The Eastern Ghats granulite belt of India has traditionally been described as a Proterozoic mobile belt, with probable Archaean protoliths. However, recent findings suggest that synkinematic development granulites took place in compressional tectonic regime and facies metamorphism resulted from crustal thickening. field, petrological geochemical studies charnockite massif tonalitic to trondhjemitic composition, associated rocks, document dehydration partial melting basic rocks at lower...
Using analogue experiments on polymethylmethaacrylate (PMMA) models, we investigated the process of deformation localization at tips preexisting planar shear cracks. Experiments show that this can take place in any following four principal mechanisms. Mechanism A : Brittle is dominant and forms a pair long tensile fractures crack tips. The propagate along compression direction transgress entire model thickness, causing failure small bulk strain (3%). B: It involves both brittle ductile...
Abstract Gypsum, an anisotropic hydrous mineral, localizes strain through dehydration‐induced embrittlement and hydrodynamic lubrication, affecting the deformation in active tectonic settings. Here, we examine micromechanical status of syn‐ post‐dehydration gypsum‐phases, crucial for understanding intra‐crystalline deformation. We micro‐indented (010) planes natural gypsum crystals from 30 to 140°C at various strain‐rates track mechanical changes during progressive dehydration phase...
Employing analogue and numerical experiments, we investigated the process of plastic creep in vicinity stiff inclusions its role formation shear zones. Analogue experiments were performed on Polymethylmethacrylate (PMMA) models pure ( ≈ 10 −4 s −1 ), which produced zones at a bulk strain >0.05. The geometrical dispositions do not conform to stress concentration map derived from plane theory elasticity. At initial stage (ɛ b < 0.03), PMMA began deform plastically four discrete...