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Effectiveness of stacking in filtering noise from surface wave data

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Abstract

Multi-channel analysis of surface waves (MASW) is a popular nondestructive technique to explore subsurface earth. It is based on the Rayleigh wave’s dispersion criteria where a shorter wavelength travels through shallow depth and a relatively longer wavelength travels through deeper depth. Therefore, by generating a wide band of frequencies, the MASW technique can generate high-resolution seismic image of soil strata. However, the presence of noise can distort the multi-channel dispersion image resulting in an erroneous prediction. Noisy traces are often encountered during the field acquisition due to the use of low energy sources, background disturbances, faulty connections, etc. The two most common approaches to eliminate the presence of the noises in the records are multi-shot stacking and the use of a heavier source. In this paper, a comparison has been made between these two solutions. Twenty-four-channel field MASW shot is gathered with the help of a 20-lb heavy hammer and a 1-lb light hammer. The field data is collected in standalone mode as well as in a five-stack mode. A comparison of results demonstrates that the heavier source is more effective in filtering out noises compared to stacking.

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  1. Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India

    Tarun Naskar

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Naskar, T. Effectiveness of stacking in filtering noise from surface wave data. Int J Adv Eng Sci Appl Math 15, 55–69 (2023). https://doi.org/10.1007/s12572-023-00329-4

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