Geophysical Mapping: Problem Details Problem Name: Depth of Overburden-bedrock interface Problem Type: Civil Engineering Assigned Methods: + Acoustic logging Borehole Methods + Borehole imaging, Structure logging Borehole Methods + DC geoelectrics - Sounding Electrical Methods + Geoelectrics - Tomography (surface based) Electrical Methods + Ground penetrating radar (surface-based) Electromagnetic Methods + Refraction seismic tomography (surface-based) Seismic Techniques + Seismic crosshole tomography Seismic Techniques + Seismic noise measurements Seismic Techniques + Seismic surface waves methods Seismic Techniques + Shallow Water Seismics - Lake Seismics Seismic Techniques + Shallow reflection seismics Seismic Techniques + Shear-wave reflection seismics Seismic Techniques + Standard refraction seismics Seismic Techniques + Time-domain electromagnetics - Profiling Electromagnetic Methods + Time-domain electromagnetics - Sounding Electromagnetic Methods + Vertical seismic profiling (VSP) Seismic Techniques + Very-high resolution reflection seismics Seismic Techniques 0 DC geoelectrics - Profiling Electrical Methods 0 Electrical and induction logging Borehole Methods 0 Geoelectrics - Crosshole tomography Electrical Methods 0 Ground penetrating radar - Borehole tomography Electromagnetic Methods 0 Magnetotellurics, Controlled source audiomagnetotellurics Electromagnetic Methods 0 Nuclear logging Borehole Methods 0 VLF / VLF-R, Radiomagnetotellurics Electromagnetic Methods    '+' = Technique applicable; '0' = Application possible/limited use