Mapping and attenuation of surface waves side scattered by near-surface diffractors

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Near-surface diffractors are one of the problems in land seismic exploration. They can scatter the surface wave energy emanating from the seismic source and contaminate the signal received by seismic receivers. The scattered energy from the near-surface diffractors manifests itself on seismic shot gathers as strong hyperbolic events, called diffractions, masking the weakly reflected body waves. Diffractions present complications to most of surface-wave suppression schemes, especially when they have been scattered by scatterers outside the receiver line. Different methods have been used to eliminate diffractions from seismic data, including geophone arrays, filtering, and inverse scattering. Each of those methods has its own limitations. In this study, we present processing algorithms to map and attenuate near-surface diffractors of surface waves in seismic shot gathers. The mapping algorithm is based on semblance measurements and time-offset relations, while the attenuation algorithm is based on the least-square fitting of a source wavelet. The algorithms are applied on synthetic data from two different models. The first model has three near-surface diffractors, while the second model has three clusters of near-surface diffractors. Each cluster consists of three near-surface diffractors with a different geometry for each cluster. The results show that the proposed algorithms are successful in locating and attenuating most near-surface diffractors, except when the separation between individual diffractors is below the wavelength of the diffracted surface wave.

Original languageEnglish
Pages (from-to)757-771
Number of pages15
JournalArabian Journal of Geosciences
Issue number2
StatePublished - Feb 2014


  • Mapping algorithm
  • Near-surface diffractors
  • Seismic exploration
  • Seismic noise attenuation
  • Semblance velocity analysis

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences


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