Journal ArticleDOI
Resolving phase wrapping by using sliding transform for generation of dispersion curves
Jyant Kumar,Tarun Naskar +1 more
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TLDR
This work has developed a new method that is fast, accurate, and generally resolves the unwrapping of phase with the use of just two sensors, provided the signal-to-noise ratio remains high.Abstract:
The complexity involved with the phase unwrapping procedure, while performing the existing spectral analysis of surface waves (SASW) on the basis of two sensors, makes it difficult to automate and requires frequent manual judgment. As a result, this approach generally becomes tedious and may yield erroneous results. The multichannel analysis of surface waves (MASW) technique can resolve the problem of phase wrapping. However, the MASW technique normally requires a large number of closely spaced sensors, typically 24–48 or even more. We have developed a new method that is fast, accurate, and generally resolves the unwrapping of phase with the use of just two sensors, provided the signal-to-noise ratio remains high. In this approach, the unwrapping of the phase can be performed without any manual intervention and an automation of the process becomes feasible. A few examples, involving synthetic test data and surface-wave tests, have been tested to determine the efficacy of our approach. Comparisons ...read more
Citations
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Journal ArticleDOI
High-Resolution Characterization of Near-Surface Structures by Surface-Wave Inversions: From Dispersion Curve to Full Waveform
TL;DR: In this article, a state-of-the-art review of MASW and shallow-seismic FWI and a comparison of both methods is provided. But the authors focus on the nonlinearity and resolution of the two methods.
Journal ArticleDOI
Predominant modes for Rayleigh wave propagation using the dynamic stiffness matrix approach
Tarun Naskar,Jyant Kumar +1 more
TL;DR: In this article, the authors used the dynamic stiffness matrix (DSM) approach to find the predominant mode in a dispersion plot and compared the results obtained with those reported in the literature.
Journal ArticleDOI
A faster scheme to generate multimodal dispersion plots for Rayleigh wave propagation
Tarun Naskar,Jyant Kumar +1 more
TL;DR: In this article, a faster computational scheme is proposed to determine multimodal dispersion plots using the stiffness matrix method (SMM) for Rayleigh wave propagation in horizontally layered ground media.
Journal ArticleDOI
MATLAB codes for generating dispersion images for ground exploration using different MASW transforms
Tarun Kanti Naskar,Jyant Kumar +1 more
TL;DR: In this paper , a set of codes have been developed in MATLAB for generating multimodal dispersion images by using three different transformation techniques, i.e., ω-c transform, ω − c transform and ω - c transform.
Journal ArticleDOI
Interpretation of bender element test results using sliding Fourier transform method
Jyant Kumar,Ninad Sanjeev Shinde +1 more
TL;DR: In this paper, the authors identify the arrival point of the shear wave in bender element tests using a weak P-wave compo-torque signal with ambiguous results.
References
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TL;DR: In this paper, a matrix formalism developed by W. T. Thomson is used to obtain the phase velocity dispersion equations for elastic surface waves of Rayleigh and Love type on multilayered solid media.
Journal ArticleDOI
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TL;DR: In this article, a multichannel shot gather is decomposed into a swept-frequency record, allowing the fast generation of an accurate dispersion curve, which can then be examined and its effects appraised in both frequency and offset space.
Journal ArticleDOI
Transmission of Elastic Waves through a Stratified Solid Medium
TL;DR: In this article, the transmission of a plane elastic wave at oblique incidence through a stratified solid medium consisting of any number of parallel plates of different material and thickness is studied theoretically.
Journal ArticleDOI
Multiscale seismic waveform inversion
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