Browsing by Author "Shyam Kanhaiya"

Now showing 1 - 3 of 3

Recent Developments in Earthquake Seismology Present and Future of Seismological Analysis
(Springer International Publishing, 2024) Rohtash Kumar; Raghav Singh; Shyam Kanhaiya; Satya Prakash Maurya
The book presents earthquake source, wave propagation, site amplification, and other seismological studies including earthquake simulation, application of Artificial Neural Network (ANN) in seismology, earthquake early warning system, waveform inversion, moment tensor analysis, receiver function analysis, earthquake prediction, and earthquake early warning system applications. To minimize the losses due to an earthquake, it is better to understand the source properties, medium characteristics, site condition, and amplitude of a probable earthquake at a particular site. The evolutions of earthquake source models make it possible to understand the source dynamics. However, analysis of the source using a single-domain method does not provide a better understanding of the source dynamics. Therefore, this book combines methods from the earthquake spectrum to waveform inversion and joint inversion. The book also discusses earthquake prediction methods and their reliability around the globe, and techniques of simulation viz. stochastic, empirical, semi-empirical, and hybrid, along with their limitations and application. Seismology is an interdisciplinary subject. Therefore, the information presented in the book will appeal to a wider readership from students, teachers, researchers, planners engaged in developmental work, and people concerned with earthquake awareness. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
Seismic origin of the soft-sediment deformation structures in the upper Palaeo-Mesoproterozoic Semri Group, Vindhyan Supergroup, Central India
(John Wiley and Sons Ltd, 2020) Birendra Pratap Singh; Krishna Mondal; Akanksha Singh; Preeti Mittal; Rohit Kumar Singh; Shyam Kanhaiya
Soft-sediment deformation (SSD) structures are the syn-sedimentary structures that can form by seismic as well as non-seismic processes. The SSD structures commonly occur in the Semri Group of the Vindhyan Supergroup in the Kajrahat Limestone, Chopan Porcellanite and Rohtas Limestone formations, and the Glauconitic Sandstone Member. The SSD structures include, slump folds, kink bands, chevron folds, convolute beddings, contorted cross-beds, flame structures, pinch-and-swell structures, breccias, sagging structures, water-escape structures, and dykes of varying dimensions. The lagoonal and tidal depositional environments of the Kajarahat Limestone Formation (not the continental slope environment) lead to suggest that the SSD structures formed as a result of the seismic activities in them. The SSD structures of the Chopan Porcellanite Formation associated with rhyolite might have originated as a result of volcanic activities or seismicity, while those occurring in the Glauconitic Sandstone Member (Kheinjua Formation) adjacent to the Son Lineament might have formed as a tectonics-related seismicity. The convolute bedding with large lateral extent in the Rohtas Limestone Formation looks related to seismicity in the light of its deposition along the shelf. Thus, the upper Palaeo-Mesoproterozoic Semri Group, Vindhyan Supergroup represents varieties of the SSD structures formed mostly by seismic processes. These imply that the Central India was unstable and was a place for tectonically controlled seismic events during the upper Palaeo-Mesoproterozoic (1,700–1,600 Ma). © 2020 John Wiley & Sons Ltd
Textural analysis and statistical synthesis to interpret depositional environments in the palaeochannel of the Assi River in the Central Ganga Plain, India
(Springer Nature, 2025) Mallikarjun Mishra; Shyam Kanhaiya; Birendra Pratap Singh; Koppella N. Prudhvi Raju
The current study is aimed to characterize the facies based on grain-size composition and textural parameters along the palaeo-course of the Assi River in Central Ganga Plain, India. Grain size fractions are expressed in terms of ratios of sand, silt and clay and plotted in ternary diagrams, while grain-size variations are used to explain the sediment transport mechanism, depositional history and energy levels during sedimentation. The palaeochannel deposits of the river in study largely consist of silty sandy mud with sand silt clay in various proportions. The occurrence of minor proportions of fine sands and silts in clay suggests successive stream episodes/floods in the recent past. The palaeochannel sediments show mean size ranges from 3.83 to 7.02 phi (average = 5.38 phi), indicating coarse to very fine silt, and sorting ranges from 0.81 to 2.49 phi (average = 1.87 phi), indicating moderately to very poor sorted sediments. Skewness varies from − 0.01 to 0.81(average = 0.28), indicating near-symmetrical to very fine-skewed sediment distributions and kurtosis ranges from 0.85 to 1.89 (average = 1.21) suggest that the majority of the sediments are mesokurtic to very leptokurtic in nature. The bivariate plot of mean grain size versus sorting shows that the bulk of the sediments were deposited in quiet-water environment under episodic fluvial regimes. The C–M pattern of the sediments in the palaeochannel suggests that sediments were transported in graded to uniform suspension before they are deposited. © Indian National Science Academy 2025.