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The Seismic Method
Seismic Surveys and their Interpretation
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accuracy aeromagnetic survey amplitude angle apparent velocity approximate array bedrock body borehole Bouguer anomaly boundary calculated component constant correction current electrode density contrast depth of investigation detector dipoles direction distance dyke earth's effect elastic electrical electrode electrode separation electromagnetic equation estimated example factor fault formation frequency geomagnetic field geophone geophysical give gmax gravimeter gravity anomaly ground head wave hydrophone increase instruments interpretation known lithology magnetic field measured medium method metres normal obtained ohm-m plotted poles porosity position possible potential difference potential electrodes potential gradient prospecting pulse range ratio ray paths receiving coil recording reflection reflection seismology reflector refraction result rocks sandstone secondary field sedimentary sedimentary basins seismic velocities seismic waves seismogram shot shotpoint shown in Fig signal simple spacing station subsurface surface survey thickness transmitter travel-time graphs traverse usually variation velocity vertical Wenner