Field Geophysics

This handy pocket-sized field guide provides practical information and assistance to anyone engaged in small-scale surveys on the ground. Fully revised and updated throughout, the Fourth Edition includes comprehensive updates on the use of GPR and GPS and new sections on surface wave seismics and towed array systems. This has become the standard text in this area for use in the field and the experience of the two authors will ensure the book retains its place as one of the most popular handbooks in applied geophysics. Fully revised and updated to incorporate new developments in the field; Focus on quality control of the acquisition of data and basic field interpretation; User-friendly, accessible writing style; Includes updates on Ground Penetrating Radar and the use of GPS; New section on surface wave methods. Additional material available on the companion website at wiley.com/go/milsom/geophysics4e

This handy pocket-sized field guide provides practical information and assistance to anyone engaged in small-scale surveys on the ground. Fully revised and updated throughout, the Fourth Edition includes comprehensive updates on the use of GPR and GPS and new sections on surface wave seismics and towed array systems. This has become the standard text in this area for use in the field and the experience of the two authors will ensure the book retains its place as one of the most popular handbooks in applied geophysics.* Fully revised and updated to incorporate new developments in the field;* Focus on quality control of the acquisition of data and basic field interpretation;* User-friendly, accessible writing style;* Includes updates on Ground Penetrating Radar and the use of GPS;* New section on surface wave methods.Additional material available on the companion website at wiley.com/go/milsom/geophysics4e

Preface to the First Edition ixPreface to the Second Edition xPreface to the Third Edition xiiPreface to the Fourth Edition xiv1 Introduction 11.1 What Geophysics Measures 11.2 Fields 11.3 Geophysical Survey Design 91.4 Geophysical Fieldwork 141.5 Geophysical Data 191.6 Bases and Base Networks 291.7 Real-Time Profiling 322 Gravity Method 392.1 Physical Basis of the Gravity Method 392.2 Gravity Meters 412.3 Gravity Reductions 492.4 Gravity Surveys 522.5 Field Interpretation 613 Magnetic Method 653.1 Magnetic Properties 653.2 The Magnetic Field of the Earth 673.3 Magnetic Instruments 723.4 Magnetic Surveys 753.5 Simple Magnetic Interpretation 814 Radiometric Surveys 854.1 Natural Radiation 854.2 Radiation Detectors 904.3 Radiometric Surveys 925 Electric Current Methods: General Considerations 975.1 Resistivity and Conductivity 975.2 Varying Currents 1026 Resistivity Methods 1096.1 DC Survey Fundamentals 1096.2 DC Practicalities 1176.3 Resistivity Profiling 1226.4 Resistivity Depth-Sounding 1256.5 Electrical Resistivity Imaging (ERI) 1286.6 Capacitive Coupling 1337 SP and IP 1377.1 SP Surveys 1377.2 Polarisation Fundamentals 1407.3 Time-Domain IP Surveys 1437.4 Frequency-Domain Surveys 1447.5 IP Data 1468 Electromagnetic Methods 1498.1 Two-Coil CW Systems 1498.2 CWEM Conductivity Mapping 1588.3 Fixed-Source Methods 1618.4 Transient Electromagnetics 1659 Remote-Source Electromagnetics 1719.1 Natural Electromagnetic Radiation 1719.2 Controlled-Source Audio-Magnetotellurics (CSAMT) 18010 Ground Penetrating Radar 18510.1 Radar Fundamentals 18510.2 GPR Surveys 19910.3 Data Processing 20511 Siesmic Methods: General Considerations 21111.1 Seismic Waves 21111.2 Seismic Sources 21611.3 Detection of Seismic Waves 22211.4 Recording Seismic Signals 22612 Seismic Reflection 22912.1 Reflection Theory 22912.2 Reflection Surveys 23313 Seismic Refraction 24113.1 Refraction Surveys 24113.2 Interpretation 24713.3 Limitations of the Refraction Method 25714 Seismic Surface Wave Methods 26114.1 Surface Wave Surveys 26114.2 Data Processing 26614.3 Limitations of the Method 27015 Maps, Mapping and GPS 27315.1 Maps and Mapping 27315.2 Satellite Navigation 276Appendix: Terrain Corrections for Hammer Zones B to m 281Index 283