Noise Reduction Technique Applied to the Multichannel Analysis of Surface Waves
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This research is supported by Research Project of Science Fund No. 01-01-02-SF0338 and Science Fund No. 01-01-02-SF0681 from Ministry of Science, Technology and Innovation of Malaysia.


Noise Reduction Technique Applied to the Multichannel Analysis of Surface Waves
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    摘要:

    This paper shows the presence of noises and technique to reduce these noises during the surface wave analysis. The frequency-dependent properties of Rayleigh-type surface waves can be used for imaging and characterizing the shallow subsurface. Interference by coherent source-generated noise inhibits the reliability of shear-wave velocities determined through inversion of the phase velocities of Rayleigh waves. Among these interferences by non-planar, non-fundamental mode Rayleigh waves (noise) are body waves, scattered and non-source-generated surface waves, and higher-mode surface waves. For the reduction of noise, the filtering technique is implemented in this paper for the multichannel analysis of surface wave method (MASW). With the de-noising technique during the MASW method, more robust and reliable outcome is achieved. The significance of this paper is to obtain pre-awareness about noises during surface wave analysis and take better outcomes with de-noising performance in near surface soil investigations.

    Abstract:

    This paper shows the presence of noises and technique to reduce these noises during the surface wave analysis. The frequency-dependent properties of Rayleigh-type surface waves can be used for imaging and characterizing the shallow subsurface. Interference by coherent source-generated noise inhibits the reliability of shear-wave velocities determined through inversion of the phase velocities of Rayleigh waves. Among these interferences by non-planar, non-fundamental mode Rayleigh waves (noise) are body waves, scattered and non-source-generated surface waves, and higher-mode surface waves. For the reduction of noise, the filtering technique is implemented in this paper for the multichannel analysis of surface wave method (MASW). With the de-noising technique during the MASW method, more robust and reliable outcome is achieved. The significance of this paper is to obtain pre-awareness about noises during surface wave analysis and take better outcomes with de-noising performance in near surface soil investigations.

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Taohidul ISLAM, Zamri CHIK and Mohd Marzuki MUSTAFA.2012. Noise Reduction Technique Applied to the Multichannel Analysis of Surface Waves[J]. ACTA GEOLOGICA SINICA(English edition),86(5):1306~1311

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  • 收稿日期:2011-10-11
  • 最后修改日期:2012-05-11
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