GEOPHYSICS is 75 years old this year. To celebrate this milestone, the editors decided to publish a special section in our journal containing a series of specially invited review papers to summarize the current state of the art in exploration geophysics, but with particular emphasis on developments during the past five years. The papers you will find in what follows describe a number of areas in which significant progress has been made. Of course it has not been possible to do justice to all areas of our field, yet the wide range of subjects covered surely indicates the current...

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