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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 coil component constant correction current electrode current flow 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 gravimeter gravity anomaly ground head wave horizontal hydrophone increase instruments interface interpretation known magnetic field measured medium method metres normal obtained ohm-m plane plotted poles porosity position possible potential difference potential electrodes potential gradient prospecting pulse range ratio ray paths recording reflection reflection seismology reflector refraction result rocks sandstone sedimentary sedimentary basins seismic velocities seismic waves seismogram shape shot shotpoint shown in Fig signal simple spacing subsurface surface survey thickness transmitter travel-time graphs traverse usually variation velocity vertical Wenner