Preface; Acknowledgments; 1. Introduction; 2. Data analysis; 3. Magnetics; 4. Electrical resistivity method; 5. Induced polarization and self-potential; 6. Seismic reflection and refraction; 7. Seismic surface wave analysis; 8. Electromagnetic induction; 9. Ground-penetrating radar; 10. Emerging techniques; 11. Linear inversion; 12. Nonlinear inversion: local methods; 13. Nonlinear inversion: global methods; Appendix A. Shannon sampling theorem; Appendix B. Solution of Laplace's equation in spherical coordinates; Appendix C. The linear t -- p transformation of seismic data; Appendix D. Horizontal loop over a conducting halfspace; Appendix E. Radar TE waveguide mode equations; References; Index.