It is well-established that the magnetic fabric of rocks reflects the petrofabrics determined by other means but the magnetic method is very much faster and is many times more sensitive in areas of low strain. This method therefore provides a rapid, cheap and precise way of evaluating the strain evolution and strength of all rock types. This book provides a comprehensive background to the physical, instrumentation and geological aspects behind such magnetic anisotropy studies in the hope that geoscience readers are encouraged to use this new, simple, but powerful method, and to develop a greater understanding of how to re-interpret much published work. Structural geologists, sedimentologists, petrologists, reservoir engineers, hydrologists, engineering geologists, indeed most geoscientists, should find this a useful introductory reference to this emerging method of analysis. Structural geologists, sedimentologists, petrologists and those involved in economic and engineering geology should find this a useful introductory reference to this emerging method of analysis. This book should be of interest to professionals and researchers in petrology, sedimentology; and economic geologists in hydrocarbon, metal and quarrying industries.