mercredi 29 juillet 2015

Field Geophysics (4th ed.) [J. Milsom & A. Eriksen, 2011]

The purpose of this book is to help anyone involved in small-scale geophysical
surveys. It is not a textbook in the traditional sense, in that it is designed
for use in the field and concerns itself with practical matters – with theory
taking second place. Where theory determines field practice, it is stated,
not developed or justified. For example, no attempt is made to explain why
four-electrode resistivity works where two-electrode surveys do not.
The book does not deal with marine, airborne or downhole geophysics,
nor with deep seismic reflection work. In part this is dictated by the space
available, but also by the fact that such surveys are usually carried out by
quite large field crews, at least some of whom, it is to be hoped, are both
experienced and willing to spread the benefit of that experience more widely.
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Where appropriate, some attention is given to jargon. A field observer
needs not only to know what to do but also the right words to use, and right
in this context means the words which will be understood by others in the
same line of business, if not by the compilers of standard dictionaries.
A word of apology is necessary. The field observer is sometimes referred
to as ‘he’. This is unfortunately realistic, as ‘she’ is still all too rare, but is
not intended to indicate that ‘she’ is either unknown or unwelcome in the
geophysical world. It is hoped that all geophysical field workers, whether
male or female and whether geophysicists, geologists or unspecialized field
hands, will find something useful in this book.
Finally, aword of thanks. Paul Hayston of BP Minerals and Tim Langdale-
Smith ofTerronics read early drafts of the text and made numerous invaluable
suggestions. To them, to Janet Baker, who drew many of the sketches, and
to the companies which provided data and illustrations, I am extremely
grateful.
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