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.                 .                      .                           (3 m)  ,   ,    .     ()       S    S (MASW)   (CMPCC)    ,  MASW     S/N   CMPCC        .:  ,  ,   S ,  Although geophysical methods are useful and generally provide valuable information about the subsurface, it is impor-tant to recognize their limitations. A common limitation is the lack of sufficient contrast in physical properties betweendifferent layers. Thus, multiple methods are commonly used to best constrain the physical properties of different layersand interpret each section individually. Ground penetrating radar (GPR) and shallow seismic reflection (SSR) methods,used for shallow and very shallow subsurface imaging, respond to dielectric and velocity contrasts between layers, respec-tively. In this study, we merged GPR and SSR data from a test site within the Cheongui granitic mass, where the watertable is ~3 m deep all year. We interpreted the data in combination with field observations and existing data from drillcores and well logs. GPR and SSR reflections from the tops of the sand layer, water table, and weathered and soft rocksare successfully mapped in a single section, and they correlate well with electrical resistivity data and SPS (suspension PS)well-logging profiles. In addition, subsurface interfaces in the integrated section correlate well with S-wave velocity struc-tures from multi-channel analysis shear wave (MASW) data, a method that was recently developed to enhance lateral res-olution on the basis of CMP (common midpoint) cross-correlation (CMPCC) analysis.Key words: dielectric interface, velocity interface, MASW, CMP cross-correlation*Corresponding author: geop22@cbnu.ac.krⓒ 2015, The Korean Society of Engineering Geology

Geophysical Imaging of Alluvial Water Table and the underlying Layers of Weathered and Soft Rocks