Three techniques for improving shallow refraction data are reviewed. Frequency filtering, directional arrays, and multiplicity summing all have advantages and disadvantages. Frequency filtering requires that the signal and noise fall into different frequency bands, but large attenuation of noise can be realized if the technique is applied properly. An 80 Hz, high pass filter is used to obtain better data in an area with strong 60 Hz induced noise and low frequency traffic noise. A directional array is used to enhance data close to seismic noise caused by traffic, but arrays are cumbersome and difficult to use. Multiplicity summing is a popular improvement technique, and easy to use, however, there is a diminishing return on the field effort applied. It is suggested that under some circumstances the user may wish to use several techniques simultaneously.

  • Supplemental Notes:
    • The Symposium held on April 2-4 1975 at Moscow, Idaho, was jointly sponsored by Idaho Transportation Department University of Idaho, Moscow; Idaho State University Pocatello; and Boise State University.
  • Corporate Authors:

    Idaho Department of Highways

    P.O Box 7129
    Boise, ID  United States  83707
  • Authors:
    • Johnson, W E
  • Publication Date: 1975-4

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Filing Info

  • Accession Number: 00127652
  • Record Type: Publication
  • Created Date: Mar 10 1976 12:00AM