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3-D High-Resolution Reflection Seismic Imaging Of Unconsolidated Glacial SedimentsNormal access

Authors: F. Büker, H. Horstmeyer and A.G. Green
Event name: 11th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Methods Emphasis: Shallow Seismic Reflection
Publication date: 22 March 1998
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.79Mb )

Shallow 3-D reflection seismic techniques have been used to map glacial deposits overlying the
Swiss Molasse Basin. A dense distribution of source and receiver positions resulted in a small CMP
bin size of 1.5 m x 1.5 m and a high fold >40. Common processing operations such as
deconvolution and bandpass filtering successfully enhanced shallow reflections relative to sourcegenerated
noise. Erroneous stacking of refracted and guided waves was avoided by careful selection
of top mutes. Three-dimensional migration of the stacked data yielded a reliable high-resolution
image of the shallow subsurface (cl50 m). Based on borehole information a continuous reflection
at 20 to 40 ms (-14 to -35 m) can be correlated with an interface between near-surface lacustrine
deposits and underlying glacial tills. A total of five major subsurface units can be distinguished on
the basis of their characteristic seismic facies.

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