During the past decade significant progress has been made in the development of geophysical techniques designed<br>to resolve problems associated with the unconsolidated sedimentary layers of the shallow subsurface. Two of these<br>techniques, the high-resolution seismic reflection and the ground-penetrating radar (georadar) methods, have the<br>potential to define the character, size, and geometry of surficial sedimentary units. In an attempt to determine<br>optimum recording and processing strategies, seismic and gwradar reflection profiles have been recorded across<br>a variety of glacial, glaciolacustrine, and glaciofluvial deposits in Switzerland. At one test location we have also<br>conducted a pilot 3-D high-resolution seismic reflection survey and at another we have collected an experimental<br>3-D gwradar data set. Results of the 3-D surveys are striking images of the shallow subsurface that provide many<br>more details and much more reliable information on the 3-D heterogeneities of the shallow subsurface than are<br>afforded by conventional 2-D data sets; at both 3-D test sites critical geological features would have been misinterpreted<br>had only limited profile information been available.


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