Geophysical Mapping: Problem Details Problem Name: Quality and thickness (Natural resources) Problem Type: Natural Resources Assigned Methods: + Acoustic logging Borehole Methods + Borehole imaging, Structure logging Borehole Methods + DC geoelectrics - Sounding Electrical Methods + Electrical and induction logging Borehole Methods + Geoelectrics - Crosshole tomography Electrical Methods + Geoelectrics - Tomography (surface based) Electrical Methods + Nuclear logging Borehole Methods + Refraction seismic tomography (surface-based) Seismic Techniques + Standard refraction seismics Seismic Techniques + Time-domain electromagnetics - Profiling Electromagnetic Methods + Time-domain electromagnetics - Sounding Electromagnetic Methods + VLF / VLF-R, Radiomagnetotellurics Electromagnetic Methods 0 DC geoelectrics - Profiling Electrical Methods 0 Frequency-domain electromagnetics - Profiling Electromagnetic Methods 0 Frequency-domain electromagnetics - Sounding Electromagnetic Methods 0 Ground penetrating radar (surface-based) Electromagnetic Methods 0 Ground penetrating radar - Borehole tomography Electromagnetic Methods 0 Induced polarization - Sounding Electrical Methods 0 Induced polarization - Tomography (surface-based) Electrical Methods 0 Seismic crosshole tomography Seismic Techniques 0 Seismic surface waves methods Seismic Techniques 0 Shallow Water Seismics - Lake Seismics Seismic Techniques 0 Shallow reflection seismics Seismic Techniques 0 Shear-wave reflection seismics Seismic Techniques 0 Vertical seismic profiling (VSP) Seismic Techniques 0 Very-high resolution reflection seismics Seismic Techniques    '+' = Technique applicable; '0' = Application possible/limited use