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MATLAB codes for generating dispersion images for ground exploration using different MASW transforms

Naskar, T and Kumar, J (2022) MATLAB codes for generating dispersion images for ground exploration using different MASW transforms. In: Geophysics, 87 (3). pp. 1-37.

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Official URL: https://doi.org/10.1190/geo2020-0928.1

Abstract

A set of codes have been developed in MATLAB for generating multimodal dispersion images by using three different transformation techniques. While performing the multichannel analysis of surface waves (MASW), the field data obtained by using multiple geophones, in distance and time domain, become the required input data for these developed programs. The dispersion images have been examined by generating synthetic data, and performing field tests using a 20 lbs hammer at two different chosen sites with 48 geophones. The dispersion plots from the three different transformation techniques were found to match very closely with each other. The ω-c transform generally provides the best clarity. An increase in the spread length, however, without increasing the number of sensors often leads to development of aliased modes in the dispersion images.

Item Type: Journal Article
Publication: Geophysics
Publisher: Society of Exploration Geophysicists
Additional Information: The copyright for this article belongs to the Society of Exploration Geophysicists.
Keywords: Dispersion (waves); MATLAB; Shear flow; Shear waves; Surface waves; Time domain analysis; Wave propagation, Field data; Multi-channel analysis of surface waves; Multi-modal; Multichannel analysis of surface-wave methods; Shear wave velocity; Sub-surface exploration; Sub-surfaces; Surface exploration; Time domain; Transformation techniques, Nondestructive examination, computer simulation; mineral exploration; numerical model; S-wave; wave propagation; wave velocity
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 01 Jul 2022 06:27
Last Modified: 07 Jul 2022 04:59
URI: https://eprints.iisc.ac.in/id/eprint/74046

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