The idea for this book originated in 1987 while I was preparing for lectures on courses in applied geology and environmental geo• physics at Plymouth Polytechnic (now the University of Plymouth), Devon, England. Students who had only very basic mathematical skills and little if any physics background found most of the so• called 'introductory' texts difficult to follow owing to the perceived opacity of text and daunting display of apparently complex math• ematics. To junior undergraduates, this is immediately offputting and geophysics becomes known as a 'hard' subject and one to be avoided at all costs.
I hope that the information on the pages that follow will demon• strate the range of applications of modern geophysics - most now very well established, others very much in the early stages of imple• mentation. It is also hoped that the book will provide a foundation on which to build if the reader wishes to take the subject further. The references cited, by no means exhaustive, have been included to provide pointers to more detailed discussions.
The aim of this book is to provide a basic introduction to geo• physics, keeping the mathematics and theoretical physics to a min• imum and emphasising the applications. Considerable effort has been expended in compiling a representative set of case histories that demonstrate clearly the issues being discussed,
The first edition of this book was different from other introduc• tory texts in that it paid attention to a great deal of new material, or topics not previously discussed in detail: for example, geophysical survey design and line optimisation techniques, image-processing of potential field data, recent developments in high-resolution seis• mic reflection profiling, electrical resistivity Sub-Surface Imaging (tomography), Spectral Induced Polarisation, and Ground Pene• trating Radar, amongst many other subjects, which until 1997,when the first edition was published, had never featured in detail in such a book. While retaining much of the basic theory and principles from
the first edition, the scope of material has been expanded consider• ably in the second edition to reflect the changes and developments in the subject. Consequently, there is much new material. Many new and unpublished case histories from commercial projects have been included along with recently published examples of applications.

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