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Geosounding principles, 1. resistivity sounding measurements
375 contains over 600 pages the coverage has to be quite thorough. Apart from the points already mentioned the only other slight annoyance concerns the somewhat inconsistent treatment of dimensional and dimensionless quantities; one has to keep track of starred, primed and unseripted quantities and be careful when one or the other is dropped (or added) 'for (the sake of) neatBess'. In conclusion, this is an excellent book well worth a prominent position on the bookshelf or desk of my serious students of G.F.D. We all will find a great deal of useful information between its covers, information that forms the basis for the subject and is unlikely to be supplanted very quickly. Tony Maxworthy Los Angeles, Calif.
O. Koefoed, 1979. Geosounding Principles, I. Resistivity Sounding Measurements. Elsevier, Amsterdam, 272 pp., Dfl. 130.00, U.S. $ 63.50. The Schlumberger method of electrical sounding is one of the oldest of the electrical geophysical methods, and comes as close as any technique does to being a standard technique. The method has been favored by geophysicists and engineering and groundwater applications for many years, in spite of the fact that a wide variety of other electrode arrays have come into use, as well as other electrical methods based on electromagnetic conduction. Over the years, several definitive papers and several textbooks have been written which describe the theory and use of the Schlumberger methOd in resistivity sounding. The book by Koefoed represents a very real contribution to the literature relavent to resistivity soundings. The book consists of a brief first chapter that describes field procedures and methods of measurement. The major part of the book, comprising the next eight chapters, deals with the theory of the Schlumberger method for the case of laterally uniform layered earth. In these seven chapters, three essentially different theoretical aspects of the problem are treated, these being the behavior of the kernel function, the use of convolution filters to evaluate the resis-
tivity function, and the use of computerbased inversion schemes. The discussion of the kernel function is very complete, treating various approaches to its representation. The discussion of convolution filters that are used in converting the kernel function to apparent resistivity is very thorough as well. The section on computer-assisted interpretation and inversion is not as complete in a formal mathematical sense, but is much more understandable than most presentations of this essentially mathematical theory. Chapter 11 has the title q h e Effects of Deviations From the Fundamental Assumptions'. In effect, the chapter treats briefly a variety of more general problems than would fall under the layered earth category. Only a few pages are devoted to each of the topics including anisotropy, continuously variable resistivity distributions, and nonhorizontal boundaries, This section may leave the reader with the idea that the problems that arise when the earth is not horizontally layered are less important than they really are. Chapter 12 discusses borehole logging and model experiments. The amount of information given on these topics is very limited. The book is very well written, even though there is considerable mathematical material contained. The author treats the various topics as they apply to Schlumberger sounding, but the essential features of most of the chapters in this book can readily be extended to non-Schlumberger type arrays, and to a considerable extent, to the theory for electromagnetic sounding in a layered medium. Thus, the book should be of value to anybody deeply involved in the use of electrical methods for sounding the earth. George V. Keller, Golden, Colo.
TECTONICS J. Makiyama, 1979. Tectonomechanics. An Introduction to Structural Analysis o f Folded Oil-Field Rocks. Tokai University Press, Tokyo, 135 pp., U.S. $ 100.00. I find this book difficult to review and unusual in many ways, Notwithstanding its
O. Koefoed, 1979. Geosounding Principles, I. Resistivity Sounding Measurements. Elsevier, Amsterdam, 272 pp., Dfl. 130.00, U.S. $ 63.50. The Schlumberger method of electrical sounding is one of the oldest of the electrical geophysical methods, and comes as close as any technique does to being a standard technique. The method has been favored by geophysicists and engineering and groundwater applications for many years, in spite of the fact that a wide variety of other electrode arrays have come into use, as well as other electrical methods based on electromagnetic conduction. Over the years, several definitive papers and several textbooks have been written which describe the theory and use of the Schlumberger methOd in resistivity sounding. The book by Koefoed represents a very real contribution to the literature relavent to resistivity soundings. The book consists of a brief first chapter that describes field procedures and methods of measurement. The major part of the book, comprising the next eight chapters, deals with the theory of the Schlumberger method for the case of laterally uniform layered earth. In these seven chapters, three essentially different theoretical aspects of the problem are treated, these being the behavior of the kernel function, the use of convolution filters to evaluate the resis-
tivity function, and the use of computerbased inversion schemes. The discussion of the kernel function is very complete, treating various approaches to its representation. The discussion of convolution filters that are used in converting the kernel function to apparent resistivity is very thorough as well. The section on computer-assisted interpretation and inversion is not as complete in a formal mathematical sense, but is much more understandable than most presentations of this essentially mathematical theory. Chapter 11 has the title q h e Effects of Deviations From the Fundamental Assumptions'. In effect, the chapter treats briefly a variety of more general problems than would fall under the layered earth category. Only a few pages are devoted to each of the topics including anisotropy, continuously variable resistivity distributions, and nonhorizontal boundaries, This section may leave the reader with the idea that the problems that arise when the earth is not horizontally layered are less important than they really are. Chapter 12 discusses borehole logging and model experiments. The amount of information given on these topics is very limited. The book is very well written, even though there is considerable mathematical material contained. The author treats the various topics as they apply to Schlumberger sounding, but the essential features of most of the chapters in this book can readily be extended to non-Schlumberger type arrays, and to a considerable extent, to the theory for electromagnetic sounding in a layered medium. Thus, the book should be of value to anybody deeply involved in the use of electrical methods for sounding the earth. George V. Keller, Golden, Colo.
TECTONICS J. Makiyama, 1979. Tectonomechanics. An Introduction to Structural Analysis o f Folded Oil-Field Rocks. Tokai University Press, Tokyo, 135 pp., U.S. $ 100.00. I find this book difficult to review and unusual in many ways, Notwithstanding its