This handy pocket-sized book provides practical information and assistance to anyone engaged in small-scale surveys on the ground. The 3rd edition updates the considerable changes in instrumentation, and far-reaching developments in applications that have occurred since 1996. New sections include details on Ground Penetrating Radar, VLF and CSAMT/MT, GPS navigation, electromagnetic methods of conductivity mapping, capacity coupling, and audiomagnetotellurics (AMT).
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Electric Current Methods General Considerations
VLF and CSAMTMT
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aerials alternating current amplitude anomaly apparent resistivity approximately arrivals attenuation Bouguer Bouguer plate cable calculated common conductivity conductors constant contour corrections CSAMT current flow curve data loggers decay defined density detected detector dipole dipole-dipole direct wave distance diurnal drift effects electrical electrodes electromagnetic energy equal equation errors estimated factor Figure frequency gamma rays geological geophones geophysical gradient gravity meters ground surface horizontal in-phase induced instruments interface interpretation inverse-square law layer lines loop magnetic field magnetometer measured methods metres minerals needed noise normal observed obtained P-wave phase plot polarization position primary field produced profiles proton pseudo-sections quadrature radar radiation radioactive radioactive decay readings receiver coil recorded reflection refraction refractor rock Schlumberger secondary field Section seismic seismographs sensor shot point signal skin depth slope spacing surveys target terrain transmitter traverse usually values variations vary velocity vertical voltage